work out
buy a cheap, old, broken car, and make it work again and look nice
cut grass
kill your parents
go swimming
learn to play basketball (if you're black), golf (if you're white & rich), or soccer (if you're white & not rich. or anything else really)
go to college
browse netflix (you'll be able to spend all day on that, you don't even need to watch anything)
become a lumberjack
host a christmas party
etc.
there's plenty to do