Watch Television or youtube videos.
Go out to see a movie in a theater.
Clean your house, turn up some music and dance.
Play video games, play board games such as checkers or any of the others.
Read a good book.
Get outside and dance and sing in the rain. lol
Even when it's raining outside you can still get outside if you get bored of being in the house.
Sometimes going out and walking in the rain can be refreshing.