Heres pretty much all the possible things you can do that arent too difficult and are enough to pass the time
Listen to Music
Draw
Play Cards
Bring mini portable games (solitaire, hangman etc.)
Gameboy (get a long non repetitive game such as pokemon)
Do something for the sport you play (i string lax heads)
Bring a variety of magazines (skiing, cars, catalogs)
Write a story, its quite fun, give copies to your friends
Read a good book or a mini series
Artsy stuff (flip book, collage, scrap book)
Sudokus, Crossword Puzzles, Riddles, Different puzzles
Talk to people around you, make friends w/ people your age
Bring Old things to look through (pictures, yearbooks etc)
Get books or stuff on Spain and learn about it?
and wacking it every few hours will help in the downtime