Call some friends and see if you guys can get together.
Go swimming
Draw/doodle
Learn how to do something. (i.e. a new language, juggle, play the piano..)
Write in a journal.
If you're a girl, find some old fashion magazines, cut out some cute things, and then paste them into an old notebook. You can make outfits out of things you find from the magazines.
Prank call people. (Nothing mean though!)
Skateboard/ride your bike/Rollerblade etc.
Listen to some music and sing along. Look up some new bands and artists to listen to, if you want a change from your usual favorites.
If you're home alone, sing an octave higher to songs that men sing, and an octave lower to songs that women sing or vice versa.
If your home is well-stocked with food, you can try out a new recipe
