I need things to do on a rainy day
Play poker(with yourself or with a friend/brother/sister ect)
Write a story
Play a game
watch t.v or a movie
read a book
Go to a friends house
play a board game
Make a movie or an instructable
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Read makezine and find something that interests you and do it.
Go out and do something that helps or benefits someone else, especially if it is something they cannot do for themselves. You will not be bored. Do not worry about getting paid for it. Just give your efforts as a gift.
I was going to say climb trees, but you literally meant it was raining instead of just a boring day, then that could be too dangerous.
Sleeping is a good option. Eating and watching television is good too. Rent some movies. Make an 'ible.