Ang Thong Marine Park Tours: Complete Guide

Everything you need to choose, book and enjoy a day trip to one of Thailand's most spectacular national parks. Updated March 2026.

What Is Ang Thong Marine Park?

Mu Ko Ang Thong National Marine Park is an archipelago of 42 limestone islands scattered across 102 square kilometres of the Gulf of Thailand, roughly 30 km northwest of Koh Samui. Established as a national park in 1980, it remains one of the most unspoilt marine environments in Southeast Asia.

The park is closed to overnight visitors and independent boat access is restricted — meaning every visit is via an organised day tour. This protects the environment and ensures you get a guided, structured experience rather than arriving unprepared.

  • 42 islands covering 102 km² of protected marine habitat
  • The Emerald Blue Lagoon (Talay Nai) — a landlocked saltwater lake at Koh Mae Ko
  • 500m panoramic viewpoint at Koh Wua Ta Lap overlooking all 42 islands
  • Sea kayaking through caves and along dramatic limestone cliffs
  • Snorkelling at coral reefs with colourful tropical fish
  • Lotus Cave (Bua Boke Cave) — stalactites and stalagmites
    • Ang Thong Marine Park aerial view of 42 limestone islands Gulf of Thailand national park
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    Who is Ang Thong best for?

    Active travellers, couples, families with older children (8+), nature lovers and photographers. The viewpoint hike is steep — not ideal for those with limited mobility.

    Tour Types at a Glance

    Four main tour formats — choose based on comfort, group size and pace preferences.

    Tour Type Duration Group Size Best For Kayak Incl.
    Big Boat (Full Day) 8–9 hrs 60–100 people Families, budget travellers ✓ (option)
    Speedboat (Full Day) 8–8.5 hrs 20–43 people Active, cover more ground ✓ (incl.)
    Half Day 4–5 hrs Varies Limited time, kids under 8 ✗ usually
    Private Charter Custom 2–12 guests Groups, honeymoon, special occasions ✓

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    Main Highlights Inside the Park

    Most full-day tours visit 2–3 of these stops. Here's what awaits at each.

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    500m Viewpoint — Koh Wua Ta Lap

    Steep nature trail with fixed ropes and steps — about 30 minutes up. The reward: a 360° panorama over all 42 islands you'll never forget.

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    Emerald Blue Lagoon — Koh Mae Ko

    A landlocked saltwater lake (Talay Nai) ringed by limestone cliffs. 10 minutes' walk up steps from the beach. The colour is extraordinary.

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    Snorkelling Reef

    Colourful tropical fish and coral formations in clear water near the limestone cliffs. Gear is usually included. Best November–April.

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    Sea Kayaking

    Paddle through sea caves and along hidden coastlines. Some tours offer exclusive routes through granite boulders to Tum Rang Island.

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    Bua Boke Cave (Lotus Cave)

    A beautiful stalactite and stalagmite cave on Koh Wua Ta Lap. Sometimes included as an optional stop on the nature trail.

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    Stone Arch — Koh Sam Sao

    A natural arch bridge stretching into the sea. Most big boat tours pass by for photos from the water.

    Practical Information Before You Book

    What to Bring

  • Trainers or hiking shoes (essential for the viewpoint trail)
  • Swimwear and a change of clothes
  • Towel and dry bag for your phone
  • Cash for the park entrance fee
  • Motion sickness tablets if you're prone on boats
  • Camera or waterproof phone case
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    Park Entrance Fee — Not Included in Tour Prices

    All tours list the park entry fee as an extra, paid at the check-in counter on arrival. Budget for this separately.

    Not Suitable For

  • Pregnant women (strenuous hike, boat movement)
  • Children under 2 years
  • People with significant mobility impairments
  • Severe seasickness sufferers (especially on speedboats)
  • People with serious back problems
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    The Hike is Optional

    You can always skip the viewpoint hike and relax on the beach — guides will tell you this before you depart. Don't let the fitness warning put you off.

    Best Time to Visit

    Sea conditions vary significantly. Plan around these windows for the best experience.

    ✓ Peak Season

    November – February

    Ideal — calm seas, brilliant visibility, all tours operate daily. Book 2–3 days ahead on peak weekends.

    ◑ Very Good

    March – April

    Excellent conditions. Slightly hotter but still calm. Good tour availability and value. Book ahead for school holidays.

    ◑ Variable

    July – August

    The Gulf side can be calmer than the Andaman Sea during SW monsoon. Many tours run, but check forecast before booking.

    ✕ Avoid

    May – June & September – October

    Monsoon. Rough seas, poor visibility and frequent cancellations. Not worth the risk unless you have fully refundable bookings.

    Tours by Departure Island

    Most tours depart from Koh Samui, but dedicated options exist from Koh Phangan and Koh Tao too.

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    From Koh Samui

    Most choice, best-priced, daily departures. 30–45 min to the park. Full guide with top picks.
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    From Koh Phangan

    Direct tours from Hadrin and Thong Sala piers. Slightly longer boat ride but avoids the ferry to Samui.
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    From Koh Tao

    Fewer options but a longer, more adventurous journey. Good for divers combining Ang Thong with Koh Tao dive sites.
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    Diving Guide

    Complete guide to scuba diving sites, visibility, and best operators for underwater adventure.
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    Speedboat vs. Big Boat

    Compare travel times, comfort, and costs to choose your perfect boat type.
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    Visitor Reviews

    What real travellers say about their day trips — Reddit tips and feedback.

    Find the Right Tour for You

    Use our comparison guide to match your travel style, budget and pace — all key details in one place.

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