Watch movies/tv, read books, check email, pay bills, write letters home, cross stitch, knit, crochet, do puzzles, re-organize your room, play solitaire, get adult coloring books (map pencils and sharpener), learn a new hobby, learn a new language (babel), hang out at the pool/bar/gym, walk the decks, take a nap, and make friends so you have someone to talk to.
How much luggage can you take?