A day, not a night
Swimming, sun, DJs from the afternoon, and sunset over the Andaman Sea from the middle of the bay. You are on the water the whole time, which is the entire point of it — there is no wandering off to the next place, so plan it as the day rather than as one stop in it.
Which pier you leave from
The speedboat transfer is part of the day. Departures run from Royal Phuket Marina through the summer months and from Patong Boat Pier from mid-November to early April. Which one applies depends on your date, and we confirm it rather than leave you to guess — they are opposite sides of the island.
Where you sit changes the day
Sofas, daybeds and poolside areas are all bookable, and the area you choose sets what comes with it. Worth thinking about before you go rather than on the boat out.