Bring: Swimmers, Sunnies, Shorts,  A good set of warm layers, lots of T shirts.
Suntan lotion that you like. Mosquito/Insect repellant lotion or spray.
There are plenty of toe bangers on the deck so bring strong, washable, rubber soled shoes ( non marking and non-slip).
Try and pack a squashable/duffel or backpacker type bag. Suitcases we will leave in the onshore lock-up