Full-Day Angthong Discovery Cruise from Koh Samui

A ten-hour cruise out of Koh Samui reaches Ang Thong National Marine Park’s uninhabited islands, limestone cliffs and the Emerald Lake — from $158 per person, rated 4.9 from 122 reviews.

The boat cruises out to the marine park, where the main stop is the Green Lagoon (Emerald Lake). From there the crew anchors off a couple of beaches for swimming and sunbathing, with the park’s limestone islands rising straight out of the water around you.

Expect a group of up to 15 people, guide commentary in English, German, French or Thai, and the practical basics covered: bottled water, soft drinks, fresh fruit, coffee and tea, plus vegan, vegetarian, gluten-free and lactose-free meals on request. A cash bar runs on board and there’s a restroom, so it’s not a stripped-down operation.

Insider Tip: The onboard bar is cash only — bring small baht notes if you plan to buy a drink mid-cruise, since there’s no card reader out on the water.

Ten hours at sea with several swimming stops suits travelers happy to give the whole day to it; anyone prone to seasickness or short on patience for group boat logistics should look at a shorter Ang Thong option instead. Free cancellation applies up to 24 hours before departure.