You can do each other's hair, use some face masks, paint your nails, watch a movie, play a board game, read magazines, go walk somewhere, call one of your friends, see if you have the ingredients to make cookies/cupcakes/whatever else, look through old pictures or yearbooks.....hmmm, I can't really think of anything else. I was just trying to think of things that my friends and I would do when I was 13.