Spend a day exploring Ang Thong Marine Park: snorkel coral gardens at Koh Wao, hike to the panoramic rim of the Emerald Lagoon on Koh Mae Ko, and enjoy a seaside Thai lunch on Koh Phaluai. This small-group cruise from Koh Samui blends marine wildlife with dramatic karst scenery.
More ways to explore the area's outdoor wonders
The engine settles into a steady thrum as Koh Samui fades on the horizon and the 42 islands of Ang Thong raise like green cliffs from the Gulf. Limestone towers lean over hidden coves, and the wind presses salt into your skin, daring you to step off the deck into glassy water.
Difficulty
moderate
Duration
5–7 hours
Fitness Level
Light to moderate fitness—comfortable swimming ability and the capacity for a short uphill walk are sufficient.
Wildlife
History
Ang Thong was declared a national marine park in 1980 to protect a diverse cluster of limestone islands, reefs, and marine habitat near Koh Samui.
Conservation
The park enforces no‑take zones and limits on tourism; visitors should use reef‑safe sunscreen, avoid stepping on coral, and take all waste off the islands.
Reserve your spot on the Ang Thong Islands Luxury Small Group Tour From Koh Samui today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Bring reef‑safe sunscreen
Sunscreen protects you and the park’s corals—apply before boarding and reapply after swims.
Prepare for light hiking
The Koh Mae Ko viewpoint is a short uphill trail on uneven limestone—sturdy water shoes help.
Guard against seasickness
Morning departures are calmer; take medication in advance if you’re prone to motion sickness.
Follow park rules
Swimming in the Emerald Lagoon is prohibited—observe from the viewpoint and avoid touching reefs.
Reef‑safe sunscreen
Protects skin while preventing damage to coral ecosystems.
summer
Water shoes
Grippy soles for landing on rocky shores and hiking the limestone path.
Light waterproof or windbreaker
Blocks spray and wind on open crossings, useful in changeable weather.
winter
Quick‑dry towel and dry bag
Keeps valuables dry and dries quickly between swims.