Ultimate Guide to Boat Tours in Koh Samui (2026)

Koh Samui is surrounded by some of the most spectacular islands in the Gulf of Thailand, and the best way to explore them is by boat. But with so many tour options — Ang Thong, Koh Tan, Koh Phangan, Koh Tao, Koh Rap, and more — how do you choose the right one? This comprehensive guide covers every boat tour available from Koh Samui in 2026, with real prices, honest comparisons, and practical tips to help you plan the perfect day on the water.

All Boat Tours at a Glance

Here's a side-by-side comparison of every boat excursion we offer from Koh Samui. Use this table to quickly compare destinations, prices, and what each tour includes:

All shared tours include hotel pickup and drop-off, guide (English/French), lunch, drinks, snorkeling equipment, life jackets, and insurance. Children 2-9 pay half price. Infants under 2 are free.

Ang Thong Marine Park

The flagship excursion from Koh Samui and the one we recommend above all others if you can only do one tour. Ang Thong National Marine Park is an archipelago of 42 limestone islands northwest of Koh Samui, featuring dramatic cliffs, hidden lagoons, white-sand beaches, and the famous Emerald Lake (Thale Nai).

The full-day tour typically includes:

• Kayaking through limestone formations and into hidden coves
• Viewpoint hike (about 500 steps) with a panoramic view of the archipelago
• Emerald Lake — a saltwater lake inside a mountain accessible via the viewpoint trail
• Snorkeling in crystal-clear water over coral reefs
• Beach time on pristine white-sand beaches

Price: 4,400 THB per adult, 2,200 THB per child (2-9). Duration: 7.5 hours. National park entry fee included. Important: Ang Thong closes from November 1 to mid-December annually due to monsoon conditions.

Read our detailed guide: Ang Thong National Park: The Definitive Guide

Koh Tan & Pig Island (Koh Madsum)

The most family-friendly tour from Koh Samui. Koh Tan and Koh Madsum (Pig Island) are just 15 minutes off the south coast by longtail boat. The waters are calm, the snorkeling is excellent, and children love feeding the friendly pigs on Koh Madsum's beach.

This tour is ideal for families with young children, beginners, and anyone who prefers calmer waters. The short boat ride means minimal travel time and more time in the water. The coral reefs around Koh Tan are shallow and teeming with tropical fish.

Price: 2,800 THB per adult, 1,400 THB per child. Duration: 6 hours. Available year-round — the south coast is protected from monsoon swells.

Read more: Koh Tan & Pig Island: Complete Tour Guide

Koh Rap BBQ Island

Koh Rap is one of Koh Samui's best-kept secrets. This tiny, uninhabited island off the south coast has a stunning white-sand beach that feels completely private. The highlight is a freshly prepared BBQ lunch right on the beach — grilled fish, seafood, chicken, and tropical fruits prepared by our crew while you swim and snorkel.

The island has excellent snorkeling with good coral coverage and plenty of marine life. It's less visited than Koh Tan, giving it a real castaway feel. Perfect for couples, small groups, and anyone seeking a more intimate experience.

Price: 3,500 THB per adult, 1,750 THB per child. Duration: 5-6 hours. Year-round availability.

Read more: Koh Rap Island: Best-Kept Secret BBQ Spot

Koh Phangan Day Trip

Koh Samui's larger sister island is famous for the Full Moon Party, but it's equally impressive as a daytime destination. Koh Phangan has some of the most beautiful beaches in the Gulf of Thailand, including Thong Nai Pan Noi, Bottle Beach (Haad Khuat), Haad Salad, and Haad Yao.

The journey takes just 20-25 minutes by speedboat, giving you a full day to explore multiple beaches, snorkel, and enjoy beachfront dining. By private speedboat, you can arrive directly on secluded beaches like Bottle Beach — accessible only by boat.

Price: 4,000 THB per adult (shared excursion). Private speedboat from 18,000 THB for up to 10 guests. Duration: 7-8 hours. Year-round availability.

Read more: Koh Phangan Day Trip from Koh Samui: Complete Guide

Koh Tao & Koh Nang Yuan

The longest day trip but arguably the most visually stunning. Koh Tao is Thailand's diving capital, and the waters around it have the best visibility and most diverse marine life in the region. Koh Nang Yuan, a trio of islands connected by a white sandbar, is one of the most photographed spots in all of Thailand.

This is a full-day commitment — the crossing takes about 1.5 hours by speedboat. But the reward is world-class snorkeling in crystal-clear water with visibility up to 20 meters on good days. You may spot sea turtles, reef sharks, and spectacular coral gardens.

Price: 5,000 THB per adult, 2,500 THB per child. Duration: 10-12 hours. Best from December to April when seas are calmest. Note: Koh Nang Yuan charges a separate 100 THB entry fee.

Read more: Koh Nang Yuan: The Ultimate Snorkeling Guide

Safari Tour 4x4

Not a boat tour, but one of our most popular excursions and a perfect complement to a day on the water. The Safari Tour takes you into Koh Samui's lush interior in a 4x4 vehicle, visiting:

• Namuang Waterfall — A spectacular two-tier waterfall with a natural swimming pool
• Jungle viewpoints — Panoramic views over the island and surrounding sea
• Rubber and coconut plantations — Learn about the island's agricultural heritage
• Local lunch — Traditional Thai food at a jungle restaurant

Price: 2,500 THB per adult, 1,250 THB per child. Duration: 6 hours. Year-round availability. Our 10-passenger van handles the steep jungle roads comfortably.

Which Tour Should You Choose?

With so many options, here's our honest recommendation based on who you're traveling with and what you're looking for:

First Time in Koh Samui?

Start with Ang Thong Marine Park. It's the signature experience and the most diverse — you get kayaking, hiking, snorkeling, and incredible scenery in a single day. If Ang Thong is closed (November - mid-December), go for Koh Tan & Pig Island instead.

Families with Young Children?

Koh Tan & Pig Island is the clear winner. Short boat ride, calm waters, shallow snorkeling, and kids absolutely love the pigs. The Safari Tour is also excellent for families — no seasickness risk and plenty of excitement.

Couples & Honeymoons?

Koh Rap BBQ for an intimate, almost private island experience with a romantic beach BBQ. Alternatively, a private speedboat charter to Koh Phangan for a day of beautiful beaches and total freedom.

Serious Snorkelers & Divers?

Koh Tao & Nang Yuan without question. The visibility and marine life diversity are unmatched. The long day is worth it for the underwater experience.

Budget-Conscious Travelers?

The Safari Tour at 2,500 THB is the most affordable option and doesn't compromise on experience. For a water-based excursion, Koh Tan at 2,800 THB offers outstanding value.

Large Groups (6+ People)?

Consider a private charter. For groups of 8-10, a private speedboat often costs less per person than individual shared tour tickets — and you get a custom itinerary, flexible schedule, and exclusive use of the boat. Read our Private vs Shared Tour comparison for detailed pricing.

Private vs Shared: Quick Guide

Every tour can be booked as a shared group excursion or a private charter. Here's the quick breakdown:

For a deep dive into pricing and recommendations, read: Private vs Shared Boat Tour: Prices, Pros & Cons

Our Fleet

At Samui Authentic, we operate our own fleet of boats, which means we control the quality, safety, and experience directly:

All boats are equipped with life jackets, first aid kits, and communication equipment. Our captains are experienced local seamen with intimate knowledge of the waters around Koh Samui.

Seasonal Guide: When to Go

Koh Samui has a tropical climate with distinct seasons that affect boat tour conditions:

Read our detailed seasonal guide: Rainy Season in Koh Samui: What to Expect

Booking Tips & Practical Advice

1. Book 2-3 days ahead for shared tours during peak season (December - March). Private charters need at least a week's notice.
2. Morning departures are best — calmer seas, better light for photos, and more active marine life for snorkeling.
3. Check what's included — our prices cover everything (park fees, lunch, equipment, transfers). Some operators exclude park fees or lunch to show lower prices.
4. Bring reef-safe sunscreen — regular sunscreen damages coral. Many tours now require reef-safe products.
5. Waterproof phone case — essential for boat trips. You'll want photos but phones and saltwater don't mix.
6. Motion sickness — if you're prone, take medication 30 minutes before departure. The waters around Koh Samui are generally calm, but the crossing to Koh Tao can be choppy.
7. Combine tours — if you have multiple days, we recommend Ang Thong + Koh Tan + Safari for the most complete Samui experience.

Frequently Asked Questions