Ang Thong Marine Park (officially Mu Ko Ang Thong National Park) is one of Thailand's most spectacular natural wonders - a pristine archipelago of 42 limestone islands rising dramatically from the Gulf of Thailand. Think emerald karsts, hidden lagoons accessible only by kayak, white-sand beaches backed by jungle-covered cliffs, and snorkeling in crystal-clear water alongside vibrant coral reefs.

Made famous by Alex Garland's novel The Beach (the inspiration for the Leonardo DiCaprio movie), Ang Thong is the best day trip from both Koh Samui and Koh Phangan. Unlike the more tourist-heavy Phi Phi Islands, Ang Thong retains a genuine sense of wildness - it's a protected national park with strict environmental rules, no permanent resorts on most islands, and waters that still feel untamed.

This guide covers everything you need to plan your visit: how to get there, which tour to book, what to expect, and how to make the most of your day in this extraordinary marine paradise.

Quick Facts

Fact Details
Official name Mu Ko Ang Thong National Marine Park
Location Gulf of Thailand, 35 km west of Koh Samui
Number of islands 42 (only a few are accessible to visitors)
Park area 102 km² (82% marine, 18% land)
Entry fee 300 THB ($9) for adults, 150 THB ($4.50) for children
Best time to visit March - October (calm seas). Park closed November - December annually
Starting point Koh Samui (most common) or Koh Phangan
Time needed Full day (7-10 hours including transfers)
Tour cost 1,500-4,500 THB ($45-135) depending on tour type

Best Time to Visit Ang Thong

Open Season: January - October

Ang Thong Marine Park is open from roughly mid-December through October, but the best conditions depend on weather:

Month Conditions Recommendation
January - February Post-monsoon, seas calming down. Some days still choppy. Good - check sea conditions before booking
March - May Calm seas, excellent visibility, dry weather. Best time - ideal for snorkeling and kayaking
June - August Generally calm, occasional afternoon showers. Very good - fewer crowds than March - May
September - October Increasing rain and swell. Visibility can drop. Fair - go early in September, skip October if possible
November - mid-December Park closed for ecological recovery during monsoon. Closed - plan around this

Important: The park officially closes every year from approximately November 1 to mid-December for ecological restoration during the monsoon season. Exact dates vary year to year - check with tour operators before booking.

How to Get to Ang Thong Marine Park

There is no public ferry to Ang Thong. You must join an organized tour or charter a private boat.

From Koh Samui

The most popular starting point. Tours depart from Nathon Pier, Bangrak Pier (Big Buddha), or Nathorn Pier depending on the operator.

Tour Type Duration Speedboat Travel Time Cost Range
Speedboat tour Full day (8-10 hrs) 45-60 min each way 1,500-3,000 THB ($45-90)
Join-in speedboat Full day 45-60 min each way 1,500-2,000 THB ($45-60)
Private charter Full day 45-60 min each way 8,000-15,000 THB ($240-450)
Big boat/slow boat Full day (longer) 90-120 min each way 1,200-1,800 THB ($36-55)

From Koh Phangan

Closer to Ang Thong than Koh Samui, with shorter travel times.

Tour Type Duration Travel Time Cost Range
Speedboat tour Full day 30-40 min each way 1,500-2,500 THB ($45-75)
Private charter Full day 30-40 min each way 6,000-12,000 THB ($180-360)

From Koh Tao

Some operators run Ang Thong day trips from Koh Tao, but the journey is longer (1.5-2 hours each way by speedboat). Only worth it if you're based in Koh Tao and can't make it from Samui or Phangan.

Tour Options: Which One to Choose?

Best for: Most travelers - good value, well-organized, covers all highlights.

A shared speedboat with 15-40 other passengers. Most tours follow a similar itinerary: kayaking, snorkeling, viewpoint hike, lunch on the beach.

What's typically included:

  • Hotel pickup and drop-off (Koh Samui/Koh Phangan)
  • Speedboat transfers
  • National park entry fee (check - some tours exclude this)
  • Kayak rental
  • Snorkeling equipment
  • Lunch (Thai buffet on the beach or on the boat)
  • Drinking water and soft drinks
  • English-speaking guide
  • Insurance

Price: 1,500-2,500 THB ($45-75) per person

Book via: Klook | Viator | GetYourGuide | Local travel agencies on Koh Samui

Option 2: Premium/Small Group Tour

Best for: Travelers who want fewer crowds, better guides, and more time at each spot.

Same itinerary as the join-in tour but limited to 8-15 people. Better guide-to-guest ratio, more comfortable boat, and often includes better food and premium equipment.

Price: 2,500-4,500 THB ($75-135) per person

Option 3: Private Charter

Best for: Families, groups of friends, honeymooners, or anyone wanting total flexibility.

Hire a private speedboat with captain and crew. You choose the itinerary, set your own pace, and avoid sharing with strangers. Most private charters include kayaks, snorkeling gear, and lunch.

Price: 8,000-15,000 THB ($240-450) for the boat (split among your group of 4-8 people, it's often comparable to premium tours)

Option 4: Big Boat/Slow Boat Tour

Best for: Budget travelers and those prone to seasickness (slower = smoother).

A larger, slower boat with 50-100 passengers. Covers the same spots but takes longer to get there, meaning less time at each stop. The upside: more stable in choppy water, and often the cheapest option.

Price: 1,200-1,800 THB ($36-55) per person

What You'll See & Do

Kayaking Through Limestone Lagoons

The highlight of any Ang Thong tour. You'll kayak through narrow channels in the limestone karsts, passing beneath rock arches and into hidden lagoons (called thalay nai - "inner sea") surrounded by towering cliffs. The water inside these lagoons is calm, emerald-green, and utterly magical.

Tips:

  • Double kayaks are standard - you'll share with a partner.
  • Paddling is moderate effort; no experience needed.
  • Go early in the day for the best light filtering through the cliffs.
  • Waterproof your phone/camera - splashes are inevitable.

Snorkeling

Ang Thong's coral reefs are healthy and colorful, with good visibility (10-20 meters in calm conditions). You'll see parrotfish, clownfish (Nemos!), angelfish, sea urchins, and occasionally sea turtles.

Best snorkeling spots:

  • Koh Wao - The most popular snorkeling site. Shallow coral gardens teeming with fish. Good for beginners.
  • Song Pee Nong - Deeper reef with larger fish and better coral formations.
  • Kho Klang - Less-visited spot with interesting rock formations underwater.

Note: Snorkeling quality depends heavily on weather and sea conditions. March - May offers the best visibility.

Viewpoint Hike at Koh Wua Talap

Most tours include a hike to the viewpoint on Koh Wua Talap, the park's headquarters island. The climb takes 20-30 minutes up a steep, well-maintained trail with rope handrails. The reward: a panoramic 360° view of the entire archipelago - 42 limestone islands stretching across turquoise water. This is the shot that ends up on postcards and Instagram feeds.

Tips:

  • Wear shoes with grip, not flip-flops. The trail is steep and can be slippery.
  • Bring water - there's no shade on the viewpoint.
  • The climb is manageable for anyone with moderate fitness.
  • If you're not up for the main viewpoint, there's a shorter walk to a lower viewpoint that's still impressive.

Beach Time at Ao Khae (Emerald Lagoon Beach)

Many tours include beach time at Ao Khae on Koh Mae Ko - a stunning white-sand beach at the base of limestone cliffs with a trail leading up to the famous Emerald Lagoon (a saltwater lake inside a collapsed volcanic crater, accessed through a cave and a viewpoint). The beach itself is excellent for swimming.

The Emerald Lagoon (Thale Nai)

A breathtaking saltwater lake nestled inside the crater of Koh Mae Ko, surrounded by sheer limestone walls covered in vegetation. You access it via a short trail and stone steps from the beach. The water is a vivid emerald green, and the silence inside the crater is profound.

What to Bring

Item Why
Sunscreen (reef-safe) The tropical sun is intense on the water. Use reef-safe sunscreen to protect the coral.
Towel Most tours don't provide towels.
Dry bag For keeping phone, camera, and valuables dry during kayaking and boat transfers.
Water shoes Useful for rocky shore entries when snorkeling.
Hat and sunglasses Essential sun protection on the boat.
Motion sickness tablets The speedboat ride can be bumpy. Take one 30 minutes before departure.
Snorkeling gear Most tours provide basic gear, but bringing your own mask ensures a proper fit.
Cash For national park fees (if not included), tips, and souvenirs.
Light rain jacket Afternoon showers are possible, especially June - October.
Waterproof camera/GoPro You'll want to capture the kayaking and snorkeling.

Typical Ang Thong Day Trip Itinerary

Here's what a standard speedboat tour looks like:

Time Activity
7:30-8:30 AM Hotel pickup (Koh Samui/Koh Phangan)
8:30-9:00 AM Depart pier by speedboat
9:00-9:45 AM Speedboat ride to Ang Thong (enjoy the views)
9:45-11:00 AM First stop: Kayaking through limestone lagoons
11:00 AM - 12:00 PM Snorkeling at Koh Wao or Song Pee Nong
12:00-1:00 PM Lunch on the beach (Thai buffet)
1:00-2:00 PM Viewpoint hike at Koh Wua Talap + Emerald Lagoon
2:00-3:00 PM Beach time - swimming and relaxing
3:00-3:45 PM Speedboat ride back
3:45-4:30 PM Arrive at pier, transfer back to hotel

Note: Itineraries vary by operator and can change based on weather and sea conditions.

Prices & Budget

Expense Cost (THB) Cost (USD)
Join-in speedboat tour 1,500-2,500 $45-75
Premium small-group tour 2,500-4,500 $75-135
National park entry fee 300 (adults) $9
Kayak rental Usually included -
Snorkeling gear Usually included (fins extra on some tours: 100-200 THB) $3-6
Underwater photo service 300-800 (optional) $9-24
Tips for crew 100-300 per person $3-9

Booking tip: Book through Klook or Viator for the best prices and instant confirmation. Local travel agencies on Koh Samui sometimes offer discounts for walk-in bookings. Always confirm that the national park fee is included in your tour price.

Important Rules & Etiquette

Ang Thong is a protected national park with strict regulations:

  1. No taking anything from the park - shells, coral, sand, plants. Fines apply.
  2. No littering - carry all trash back to the boat. Bring a reusable water bottle.
  3. No feeding fish or marine life - it disrupts the ecosystem.
  4. Don't stand on coral - use a float or tread water while snorkeling.
  5. Stay on marked trails - the islands have fragile ecosystems.
  6. Drones require permission - check with the park office before flying.
  7. Respect wildlife - you may see monitor lizards, hornbills, and sea eagles. Observe from a distance.

Practical Tips

  • Don't visit during full moon. If you're on Koh Phangan, the Full Moon Party is the same night many tours run. You'll be exhausted - pick one or the other.
  • Seasickness is real. The speedboat ride can be rough, especially January - February and September - October. Take motion sickness medication 30 minutes before departure.
  • Book 1-2 days ahead. Tours fill up during high season (March - August). Walk-in bookings are possible but risky during peak dates.
  • The park closes for monsoon. Don't plan an Ang Thong trip for November - mid-December. It will be closed.
  • Check if the national park fee is included. Some budget tours list a low price but exclude the 300 THB entry fee. Factor this in when comparing.
  • Go with a reputable operator. Cheapest isn't always best - look for operators with good reviews on Klook/Viator, proper safety equipment, and environmental practices.
  • Photography. The viewpoint, lagoons, and emerald water are stunning. Bring a waterproof camera or GoPro. A dry bag is essential for protecting your phone during kayaking.

Where to Stay: Koh Samui & Koh Phangan

Since Ang Thong is a day trip (no overnight stays allowed in the park), you'll base yourself on Koh Samui or Koh Phangan.

Koh Samui - Best Bases for Ang Thong Tours

Area Vibe Distance to Departure Piers
Bophut/Fisherman's Village Charming, mid-range, good restaurants 10-15 min to Bangrak Pier
Chaweng Busy, beachfront, nightlife, everything nearby 20-30 min to most piers
Lamai Quieter than Chaweng, beautiful beach 30-40 min to most piers
Maenam Quiet, local feel, excellent value 10 min to Nathon Pier

Koh Phangan - Best Bases

Area Vibe Notes
Thong Sala Main town, good transport connections Closest to Ang Thong departure points
Haad Rin Party beach (Full Moon Party) Further from tour departure points
Baan Tai Quieter, mid-range, nice beaches Good balance of peace and access

For the full Koh Samui accommodation breakdown, see our Koh Samui Luxury Resorts Guide and Thailand Budget Travel Guide.

Planning more of Thailand? These guides will help:

Last updated: June 2026. Prices are approximate and may vary by season, tour operator, and exchange rate. All prices shown in THB with approximate USD equivalents (1 USD ≈ 33 THB).