Phang Nga Bay is not a bay. It is a drowned mountain range — flooded by the sea thousands of years ago, leaving those impossible limestone towers standing in open water like the tops of a sunken city. Your catamaran sails over the valleys. The locals will tell you the spirits of the old hills still live in the caves. Book the trip and judge for yourself.

Here is the part nobody advertises: on a catamaran, the guy who books the boat becomes a legend. His mates arrive hungover, expecting a boat. What they get is a floating terrace with a crew, a slide and a captain who calls him “boss” all day. He does nothing. He is still the hero. That is the actual product.

Catamarans do not heel. That sounds boring until you understand what it means: nobody spills a drink, nobody turns green, and the friend who always ruins boat trips stays upright and smiling. Charter crews in Thailand know this and quietly steer nervous groups toward cats. They also know the trampoline net at the bow is where every good photo of the day gets taken. Now you know too.

Koh Yao Noi, sitting right across the water from Ao Po, has no cars on parts of it, no traffic lights, and fishermen who still head out before dawn. It also has one of the most photographed viewpoints in southern Thailand — the one where the whole bay opens up beneath you. Most charter groups never ask to stop there. Ask. Your captain will know exactly where to anchor.

The Lagoon 560 is built in France by a yard that has been turning out catamarans since 1984 — and OOSEVEN’s twin hulls mean she can sit dead still in an anchorage while the monohulls around her roll. For the person who booked the boat, that is the moment: thirty people, one sunset, nobody seasick, everybody toasting his name. Worth every dollar.