Are you a memorabilia collector of your favorite cruise lines? Tee shirts, magnets, mugs? How about books on the ship you are sailing, to add to your library? Model ships? Daily menus? Can you get lost in the shop onboard that sells everything shippy?
How about vintage liner collectibles...One Christmas my son gave me a menu from the Queen Mary's menu, Saturday, July 2, 1938. Some of the things on the menu, like, roast haunch of mutton, or herrings a la sardines, I would pass on, but the old graphics are great!