I workout or practice my instruments. If all else fails I will do (*gasp*) CHORES! DUN, DUN, DUUUUUUUUUUN. In all seriousness though if you put on some music, and audiobook, or a podcast time flies.
I listen to the heaviest metal I can find... no, just kidding. Even though I like metal! I listen to music
Listen to music, text people, browse the internet, masturbate, look through old pictures, and a few other things.
Listen to music, especially classical because classical pieces are long, read, watch a movie, get on my bike and go outside. The last one doesn't work during the winter though >.< I can usually find something to do. Lying around doing nothing isn't really my thing.