Things to Do in Sumatra: The Essential Travel Guide

Sumatra is Indonesia's most underrated island. While Bali absorbs the vast majority of international attention, Sumatra quietly offers something more varied, more raw, and in many respects more extraordinary: one of the world's last intact equatorial rainforests, wild orangutans swinging through the canopy, the largest volcanic lake on earth, active volcanoes you can climb before breakfast, indigenous cultures that have maintained their traditions for millennia, and some of the finest surf breaks in Southeast Asia.

It is the sixth-largest island in the world, and it does not reveal itself quickly. The distances are significant, the roads are often slow, and the infrastructure in some areas remains limited. That is not a warning; it is a description of a place that has retained genuine wildness and has not yet traded it for ease of consumption. If you approach Sumatra with patience and the right mindset, it delivers experiences that are simply not available anywhere else.

This guide covers the best things to do in Sumatra, organised by region, with a focus on the experiences that are worth the journey.

Key Takeaways

• Sumatra is the sixth-largest island in the world and is divided into distinct regions, each with a different character: North Sumatra (orangutans, volcanoes, Lake Toba), West Sumatra (Minangkabau culture, Mentawai Islands), and the far north (Pulau Weh, Aceh).

• Bukit Lawang in North Sumatra is the best base for jungle trekking and wild orangutan encounters inside Gunung Leuser National Park, one of the most biodiverse rainforests on earth.

• Lake Toba – the largest volcanic lake in the world – is one of Indonesia's most spectacular sights. Samosir Island, at its centre, is the heartland of Batak culture.

• Berastagi offers accessible volcano trekking, with Mount Sibayak climbable at sunrise by most fitness levels.

• The Mentawai Islands are both a world-class surf destination and the home of an indigenous people whose traditions – including tattooing and hunter-gatherer practices – have survived largely intact.

• Choosing ethical, locally run tour operators makes a significant difference to both the quality of the experience and the positive impact on local communities and ecosystems.

• The dry season (April to October) is the best time to visit most of Sumatra, though the interior rainforest can be trekked year-round.

Bukit Lawang – Jungle Trekking and Wild Orangutans

Bukit Lawang is a small riverside village at the entrance of Gunung Leuser National Park in North Sumatra, and it is the best place in the world to observe wild Sumatran orangutans in their natural habitat. The national park covers over a million hectares of primary rainforest and is a UNESCO World Heritage Site, home not only to orangutans but to Sumatran tigers, sun bears, clouded leopards, hornbills, gibbons, and Thomas's leaf monkeys, among hundreds of other species.

The experience of trekking through this jungle includes crossing rivers on foot, sleeping under a tarpaulin beside a waterfall, and waking to the sound of gibbons calling at dawn, and is one of the most powerful nature encounters available anywhere in Southeast Asia. Unlike zoo encounters or rehabilitation centres, the orangutans here are genuinely wild. Sightings are not guaranteed, which is precisely what makes them so moving when they happen.

Wild Nature Trips – Ethical Jungle Trekking from Bukit Lawang

For anyone visiting Bukit Lawang, the choice of guide is the most important decision you will make. Wild Nature Trips is a locally run, ethical trekking operation based in the village, led by experienced local guide Tara, and it is the kind of operator that reflects everything a responsible jungle trek should be.

Wild Nature Trips is committed to two principles that set them apart: they operate as a palm-oil-free company, and they maintain a zero plastic waste policy throughout every trek. These are not marketing claims but operational realities. No single-use plastics enter the jungle on their trips, and the food served during treks uses no palm oil, in direct solidarity with the forest conservation the treks are designed to celebrate.

Treks range from a one-day introduction to multi-day overnight adventures that take you deep into the primary forest, with campsites beside rivers and waterfalls, encounters with wildlife along the way, and a final river tubing ride back to Bukit Lawang that ends the experience with the right amount of joy. Groups are kept small, guides are experienced and knowledgeable about both the forest and its wildlife, and the relationship between the business and the local community is genuinely embedded, not performed.

Reviews speak consistently of guide Tara's encyclopaedic knowledge of the jungle, her ability to spot wildlife others would miss, and the quality of the food and camping experience. One guest described a week in Bukit Lawang with Wild Nature Trips as "easily one of my most memorable trips to date."

A note on ethics: When choosing any jungle trek in Bukit Lawang, look for operators who follow the Gunung Leuser National Park guidelines = no feeding wildlife, no touching orangutans, no plastic waste left in the forest. The presence of irresponsible operators in any wildlife tourism destination creates long-term harm. Wild Nature Trips is an example of how it should be done.

Berastagi – Volcanoes and the Karo Highlands

A few hours south of Bukit Lawang and at a considerably higher altitude, the highland town of Berastagi sits between two active volcanoes: Mount Sibayak (2,212 metres) and Mount Sinabung (2,460 metres, currently closed to climbers due to ongoing eruptive activity). It is a cool, green, agricultural town with strawberry farms, fruit markets, and vegetable plantations, with a character completely unlike the jungle lowlands.

Mount Sibayak is one of the most accessible volcano treks in Indonesia. The summit trail takes three to four hours return from the trailhead, passes through moss-covered forest, and opens onto a steaming crater with panoramic views across the Karo Plateau and, on clear days, all the way to Mount Sinabung. Go at sunrise. The 4 am start from Berastagi is worth it, and the light on the crater is unlike anything else. Hot springs in the valley below offer a natural recovery stop on the way back down.

Beyond the volcano, Berastagi is the gateway to Karo cultural heritage. The Karo people are one of the Batak groups of North Sumatra, with their own language, architecture, and ceremonial traditions. The Museum Pusaka Karo in town provides context, and the villages surrounding Berastagi, including the traditional longhouses of Lingga, offer a glimpse into a way of life that is still actively practised.

The Sipiso Piso Waterfall, on the road between Berastagi and Lake Toba, plunges 120 metres from the Karo Plateau into a gorge that feeds Lake Toba below. It is one of the most dramatic waterfalls in Sumatra and is worth a stop on any transit between the two areas.

Lake Toba – The World's Largest Volcanic Lake

Lake Toba is staggering in scale. Formed by a supervolcanic eruption approximately 74,000 years ago and is one of the largest volcanic events in Earth's history. The lake covers 1,145 square kilometres, reaches depths of 450 metres, and sits at an altitude of 900 metres above sea level. The island of Samosir, which rises from its centre and is larger than Singapore, is the cultural heartland of the Batak Toba people.

The Batak Toba are a Christian people with an extraordinarily rich material culture: distinctive vernacular architecture (the rumah adat, with its sweeping, boat-shaped rooflines), traditional weaving (ulos cloth), ceremonial music (gondang), and ancient royal stone tombs visible in the villages around Tomok and Ambarita on Samosir's eastern shore.

Exploring Samosir means a cheaply rented Tuk Tuk or a motorbike, and is the best way to see the island at your own pace: rice terraces, hot springs at Pangururan, hilltop viewpoints looking back across the lake, and village life largely untouched by mass tourism. Kayaking on the lake, hiking the interior of Samosir, and simply sitting on a guesthouse terrace watching the mist lift from the water in the morning are all legitimate uses of several days here.

The ferry from Parapat on the mainland to Tuk Tuk on Samosir takes about 30 minutes and runs frequently.

The Mentawai Islands – Surf and Indigenous Culture

Off the west coast of Sumatra, roughly 150 kilometres from Padang, the Mentawai Islands are famous in two entirely separate communities: surfers and anthropologists.

For surfers, the Mentawai archipelago offers some of the most consistent and powerful reef breaks in the world. Hollow, left-hand barrels like Macaronis, Rifles, and Lance's Right have been drawing professional and experienced amateur surfers since the 1990s. The waves break over shallow coral reefs in warm, clear water, with little crowding compared to better-known surf destinations. Most surfers stay on liveaboard boats that move between breaks depending on swell direction and tide.

For travellers interested in indigenous culture, the Mentawai Islands are the ancestral home of the Mentawai people. They are hunter-gatherers who have maintained their traditional way of life with remarkable continuity. Customary tattoos (among the oldest tattoo traditions in the world), communal longhouse living, ritual practices connected to the animist Arat Sabulungan belief system, and skills in hunting, fishing, and forest navigation are all still practised. Respectful homestay visits, arranged through community-connected operators, offer one of the most genuinely rare cultural encounters available anywhere in Indonesia.

The gateway is Padang; ferries and small planes connect to the main islands. The dry season (April to October) offers the best surf and easiest sea crossings.

Pulau Weh – Diving at the Tip of Sumatra

At the very northern tip of Sumatra, separated from the mainland by the Strait of Malacca, Pulau Weh is a small volcanic island with some of the finest diving in the Indian Ocean. The marine life around its reefs shows off with whale sharks, manta rays, barracudas, sea turtles, and diverse coral ecosystems, and it reflects its position at the meeting point of two major ocean bodies. It is also considerably less crowded than the dive destinations of Bali or Lombok, and the island's interior – walkable jungle, waterfalls, hot springs, and a hike up a small active volcano – provides enough above-water interest to justify several days.

Pulau Weh is also home to Sabang, which marks Kilometre Zero of Indonesia, the country's westernmost point, which is a symbolic landmark for those travelling the length of the archipelago.

Access is by ferry from Banda Aceh, itself reachable by air from Medan.

Kerinci Seblat National Park – The Last Stronghold of the Sumatran Tiger

In the highlands of central Sumatra, Kerinci Seblat National Park covers 1.3 million hectares and is one of the last places on earth where wild Sumatran tigers, rhinos, and sun bears can theoretically share the same forest. The park is rarely visited relative to Gunung Leuser, which gives it a genuine wildness and remoteness. Gunung Kerinci, at 3,805 metres, is the highest volcano in Indonesia and one of the finest summit hikes in Southeast Asia.

The park is best accessed from Sungai Penuh, a small town in Jambi province. Multi-day treks into the park's interior require licensed local guides and some logistical planning, but for serious wildlife and trekking enthusiasts, it is one of the most rewarding destinations in Indonesia.

West Sumatra – Minangkabau Culture and Bukittinggi

West Sumatra is the homeland of the Minangkabau people. It’s the world's largest matrilineal society, in which clan membership and property pass through the female line. Their culture is visible everywhere in the region: the distinctive rumah gadang (great house) architecture with its curved, multi-tiered rooflines; the rendang and other dishes that form the basis of Padang cuisine; and a social organisation that has survived centuries of Islamic influence while maintaining its pre-Islamic foundations.

Bukittinggi is the cultural centre of West Sumatra. It’s a highland town surrounded by active volcanoes, volcanic lakes, and canyon landscapes. The Sianok Canyon on the edge of town is dramatic: a deep, green gorge visible from the town's upper streets, with paths descending to the river below. The surrounding highlands contain the Harau Valley, which are narrow, waterfall-threaded gorge flanked by 100-metre granite cliffs, and Lake Maninjau, a volcanic crater lake of quiet, deep beauty.

The cuisine of West Sumatra, eaten at Padang restaurants across Indonesia but most authentic in its home region, is some of the most complex and delicious food in the country.

Practical Notes for Visiting Sumatra

Getting there: The main entry point is Medan (Kualanamu International Airport, KNO), which has direct connections from Kuala Lumpur, Singapore, and several Indonesian cities. For West Sumatra, Padang's Minangkabau International Airport (PDG) is the hub.

Getting around: Sumatra is large, and distances between major destinations are significant. Tourist minivans connect the main traveller stops in North Sumatra (Medan, Bukit Lawang, Berastagi, Lake Toba). For the rest of the island, a combination of buses, shared taxis, and internal flights is the most practical approach. The roads are often slow, so factor this into every itinerary.

When to go: April to October is the dry season and the best time for jungle trekking, volcano hiking, and beach travel across most of the island. November to March brings heavier rainfall to many areas, though the interior rainforest can be trekked year-round.

Responsible travel: Sumatra's greatest assets, like its wildlife, its rainforests, and its indigenous cultures, are under significant pressure from deforestation, palm oil expansion, and the impacts of poorly managed tourism. Choose operators who are genuinely locally owned, follow ethical wildlife guidelines, and operate with environmental awareness. Wild Nature Trips in Bukit Lawang is one example of what this looks like in practice.

Conclusion

Sumatra rewards the traveller who gives it time and approaches it with genuine curiosity. The orangutans of Bukit Lawang, the volcanic crater of Lake Toba, the waves of the Mentawai Islands, the cuisine of Bukittinggi, and the dive sites of Pulau Weh are each extraordinary in their own right, and together they make up an island that deserves far more attention than it typically receives.

The best way to experience all of it is through locally rooted operators and guides who know the land, respect its wildlife, and understand its cultures. That is the principle TRAppe is built on.

Ready to find local experiences in Sumatra and beyond? Explore on TRAppe.