We do a big work-out to try to fight some of the calories! We also read a lot, enjoy the amenities of the ship (putt putt, basketball, ping-pong), have some "alone" time and generally relax. Our teens are busy off with their new friends but we spend some time with them playing games (we had huge scrabble tournaments on our last cruise!) or doing stuff. You really can be as busy as you want. Plus, our port days are usually pretty jam packed so we enjoy those down days.