Koh Samui, a district of Surat Thani Province, is the largest island in the Gulf of Thailand and the second largest in Thailand after Phuket. It pairs a proper resort-island infrastructure with an interior that is still mostly jungle, waterfalls and coconut plantation.

Whether you want to relax on soft-sand beaches, explore lush natural landscapes, snorkel or dive, get closer to local culture, or play golf on dramatic mountain courses, Samui covers it. This guide walks through the ten experiences that consistently deliver — and how to book each one.

Jump to a section

• Ang Thong National Marine Park
• Koh Tao & Koh Nang Yuan
• Ethical elephant sanctuary
• 4WD jungle safari
• Tree Bridge Zipline
• Pig Island & Koh Tan
• ATV riding
• Samui city tour
• Koh Phangan day trip
• Samui's famous beaches

Browse all Koh Samui tours →

The best things to do in Koh Samui at a glance

Not sure what to do first? Use this to match an activity to the time and energy you have.

Durations are typical ranges — check each tour page for exact timings and inclusions.

1. Day Trip to Ang Thong National Marine Park

A tropical archipelago of 42 islands

Often called a wonder of nature, Ang Thong National Marine Park is an archipelago of 42 islands spread across roughly 100 square kilometres. Expect clear water full of marine life, powder-white beaches fringed with coconut palms, and dense jungle hiding waterfalls, caves and wildlife. If you only do one thing on Samui, make it this.

Koh Wua Ta Lap is the largest island and the park's focal point. The headline activity is the climb to the six viewpoints on Wua Ta Lap Mountain, which opens onto a panorama of the whole archipelago. The final stretch is steep and demands decent fitness — but the view is unmatched.

Beyond hiking you can kayak along the coastline, swim off the beaches, or snorkel in the shallows. Park headquarters has a restaurant and bungalows, and camping is available for anyone who wants to stay overnight under the stars.

Koh Mae is the other must-see. Its beach is beautiful, but the real draw is Thale Nai — an inland saltwater lagoon ringed by limestone cliffs, fed by an underwater cave connected to the sea. A 400-metre wooden walkway climbs to a viewpoint over the park before dropping down to the lagoon's edge.

Best time to visit and how to get there

Ang Thong sits about 30 kilometres from Koh Samui. Speedboats get you there fast and leave more time on the islands; larger boats are slower and steadier, with more deck space for taking in the scenery on the way.

Book an Ang Thong Marine Park trip →

2. Day Trip to Koh Tao and Koh Nang Yuan

Thailand's diving capital

Koh Tao — Turtle Island — is a diver's dream. Its clear water holds vibrant coral reefs and plenty of marine life, including the sea turtles it's named after. That underwater world turned Koh Tao into one of the world's busiest scuba-certification hubs and still drives the island's economy.

Above water, Koh Tao has excellent beaches. Haad Sairee is the longest and liveliest, lined with hotels, restaurants, dive schools and bars — a convenient base if you decide to extend. Plenty of visitors arrive for a day and stay for weeks.

A short boat ride away sits Koh Nang Yuan, famous for three islands linked by pristine sandbars. The hike to the viewpoint delivers the postcard shot, and the surrounding water is superb for snorkelling.

Book the Koh Tao & Koh Nang Yuan speedboat trip →

3. Meet Rescued Elephants at an Ethical Sanctuary

Elephant Jungle Sanctuary Samui

Thailand's national animal was once revered for its strength and put to work in logging and transport. Today those elephants deserve care and respect instead — and this is one of the better places on the island to give it.

At Elephant Jungle Sanctuary Samui, a 5-star rated camp, the priority is the herd's well-being: expert care, a low-stress environment, and no riding, no painting, no tricks. Just feeding, bathing and learning about the animals up close.

It's one of the most family-friendly half-days on Samui. Round-trip hotel transfers are included, and you can choose a morning or an afternoon programme.

Book your elephant sanctuary visit →

4. Explore the Jungle on a 4WD Safari

Unleash the adventurer in you on Mr. Ung's Magical Safari Tour. A rugged 4WD jeep carries you through thick jungle to hidden waterfalls and mountaintop viewpoints that ordinary rental cars simply can't reach.

You'll see the island's heart and soul along the way — Na Muang Waterfall, the mysterious Mummified Monk, and sweeping panoramas from the ridge, followed by a Thai lunch at a scenic restaurant.

Hotel pick-up and drop-off make this full-day adventure effortless.

Book the 4WD jungle safari →

5. Fly Over the Canopy on the Tree Bridge Zipline

For the biggest adrenaline hit on the island, zipline straight through Koh Samui's rainforest canopy. The Tree Bridge Zipline links 8 platforms high above the jungle floor, with ocean and mountain views between runs.

Afterwards, unwind at the tree-house restaurant tucked into the branches — drinks, snacks and a genuinely lovely outlook. A short hike from there leads to a waterfall if you want to cool off.

Guides run safety checks at every platform, so it's a thrill without the worry. Whether you're a committed thrill-seeker or just after something different, this one earns its place on the list.

Book the Tree Bridge Zipline →

6. Visit Pig Island (Koh Mudsum) and Koh Tan

Escape the crowds on Koh Tan and Koh Mudsum, two quiet islands just a short boat ride off Samui's south coast.

Koh Tan, also known as Coral Island, has clear water and healthy reef life that make it a fine snorkelling spot. Between swims you can stretch out on the white sand or wander through the small fishing village.

Koh Mudsum — Pig Island — is the relaxed one: palm-fringed sand and a resident troop of very friendly pigs. Swim, sunbathe, or walk up to the island viewpoint.

A half-day speedboat tour covers both islands with lunch included. It's the ideal choice when you want island life without a long crossing — and it works well with young children.

Book the Pig Island half-day trip →

7. Go ATV Riding Through the Hills

See Koh Samui's raw side on an ATV adventure — remote mountain tracks, river crossings and climbs to viewpoints you'd never find on the ring road.

No previous experience is required. You'll cross a real mix of terrain, from dense jungle to open hillside, and the two-hour route finishes at a secluded waterfall that makes a perfect cool-down stop. Groups stay small and are led by experienced guides.

Pick the one-hour or two-hour option depending on your schedule and appetite for dust.

Book an ATV tour →

8. Samui City Tour by Private Charter Van (5 Hours)

Samui's highlights in a single day

Circle the island in a private charter van and tick off the landmarks at your own pace. Start at the Big Buddha Temple, the 12-metre golden statue that greets every arriving flight, then slow down on Chaweng Beach for a swim and a coffee.

Carry on to Na Muang Waterfall for a dip in the pool below the falls, stop at the famously cheeky Grandmother and Grandfather Rocks at Lamai, and finish at Wat Khunaram, home of the mummified monk, with time for souvenir shopping on the way back.

It's the best first-day itinerary on Samui — a mix of culture, nature and easy sightseeing with a driver handling the logistics.

Book your private city tour →

9. Take a Day Trip to Koh Phangan

Best known for the legendary Full Moon Party, Koh Phangan offers far more than nightlife. Only 12 kilometres from Koh Samui and reachable by ferry from Samui or the mainland, it has quiet beaches, thick jungle and hidden waterfalls across its northern and eastern coasts.

Snorkellers and divers will find plenty of reef a short boat ride from Thongsala and Haad Rin piers. Accommodation runs the full range, from simple guesthouses to private pool villas, so it works equally well as a day trip or a two-night extension.

Find Koh Phangan trips →

10. Explore Koh Samui's Famous Beaches

Koh Samui has a beach for every kind of traveller — the trick is picking the right one for your trip.

Chaweng Beach is the undisputed queen — six kilometres of soft sand with the island's best nightlife and every water sport on offer. For something calmer, Lamai Beach has a more easy-going feel and the island's most photographed rock formations.

If affordable rooms and quick access to Koh Phangan matter most, Mae Nam Beach is your base. And for outright luxury and privacy, Choeng Mon Beach delivers wide, clean sand and a run of exclusive resorts.

What to Do in Koh Samui in 2, 3 or 5 Days

The list above is what to see; this is how to fit it into the days you actually have. Every itinerary below assumes hotel pick-up, so you don't need a rental car.

What to do in Koh Samui if you only have one day

Take the Ang Thong day trip. It leaves early, returns late afternoon, and packs viewpoints, kayaking, snorkelling and the Thale Nai lagoon into a single boat. If the sea is rough and the park is closed, swap in the five-hour city tour and spend the afternoon on Chaweng.

What to do in Samui when it rains

Boat trips are the first thing weather cancels, so keep a wet-weather plan: the Big Buddha and Wat Khunaram stay open, Samui's spa and Thai-massage scene is excellent value, and Fisherman's Village in Bophut is easy to wander under cover. The 4WD safari usually still runs — the jungle looks better in the rain.

What to do in Koh Samui at night

Chaweng has the island's main nightlife strip, Lamai is a quieter alternative, and the Fisherman's Village Walking Street in Bophut runs on Friday evenings with food stalls and live music. Koh Phangan's Full Moon Party is a boat ride away if the dates line up.

Planning Your Koh Samui Trip

When to visit

Koh Samui sits in the Gulf of Thailand, so its seasons run differently from Phuket. February to August is the sweet spot — calm seas, reliable boat departures and the best snorkelling visibility. October to December is the wettest stretch, when Ang Thong and longer crossings are most likely to be cancelled.

How to get there

Fly directly into Samui International Airport (USM) from Bangkok, Phuket, Chiang Mai, Singapore, Hong Kong and Kuala Lumpur. The cheaper route is a flight or train to Surat Thani, then a ferry from Donsak pier — slower, but a fraction of the airfare.

How many days do you need?

Four to five nights comfortably covers this list: one full day for Ang Thong, one for Koh Tao, one split between the elephant sanctuary and a zipline or ATV session, one for the city tour, and one left open for the beach.

Getting around the island

Samui's ring road loops the whole island in about 90 minutes without stops. Songthaews (red pick-up trucks) run fixed routes along the coast, Grab works in the main beach areas, and scooters are cheap but genuinely risky on the steep sections. Most tours in this guide include hotel transfers, which is the simplest option.

Booking tips

Most tours here include hotel pick-up across Chaweng, Lamai, Bophut, Mae Nam and Choeng Mon. Confirm your pick-up window the evening before, and bring reef-safe sunscreen, a reusable water bottle and a dry bag for boat days.