Board a big boat at dawn and cross to Ang Thong’s 42 islands for a day of cliff-top views, a hidden emerald lagoon, shore snorkeling and optional kayaking. This full-day trip pairs accessible adventure with practical on-board comforts.
More ways to explore the area's outdoor wonders
You step aboard as the sun lifts over Koh Samui, salt on the air and a wide blue opening before you. The big boat peels away from the pier; for about 1 hour 45 minutes you ride a steady swell toward a scatter of limestone islands, each one a cliff-hemmed island that seems to challenge you to explore it.
Difficulty
easy
Duration
8 hours
Fitness Level
Suitable for general travelers with basic mobility; requires climbing short steep steps to viewpoints and boarding small long-tail boats.
Wildlife
History
The archipelago was designated a marine national park to protect its islands and reefs; its limestone formations are part of the region’s geologic uplift and coral growth.
Conservation
Visitors should use reef-safe sunscreens, avoid stepping on coral, and follow guides’ instructions—marine protection rules keep reefs healthy for snorkeling and fishing communities.
Reserve your spot on the Explore Angthong National Marine Park by Big Boat 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
The park restricts chemical sunscreens; use reef-safe lotion and reapply before entering water.
Wear water shoes
Beaches and shore entries can be rocky—light water shoes protect feet during snorkeling and kayak launches.
Take motion-sickness meds
The crossing is up to 1 hour 45 minutes in open water—plan medication if you’re prone to seasickness.
Start early and hydrate
Pickup begins around 07:15; bring water and snacks for comfort between boat stops.
Reef-safe sunscreen
Protects skin while minimizing damage to coral and marine life.
summer
Water shoes
Useful for rocky shore entries, kayak launches, and walking on coral-slab beaches.
summer
Quick-dry swimwear & towel
Dries fast between swims and keeps you comfortable on the boat.
summer
Dry bag or waterproof phone case
Keeps phone, ID and cash dry during transfers and on long-tail boats.
summer