What can I do on a ship?

That depends on the ship, but generally the larger ships will have the most activities. You may wish to lounge on deck by the pool with a good book, sign up for exercise or cooking classes, swim, play bingo or bridge, gamble in the casino, take in a Broadway-style floor show or a magician's act, enter a talent show or a putting contest, take a dance class, get a massage or attend a lecture.