Play hide-n-go-seek in the dark!
Pretend to get lost in the woods for a day.
Climb on the roof and jump off hold trash bags like parachutes! xD (no really, don't)
Watch a Walker, Texas Ranger marathon.
Go to the tallest building in your town (with an elevator) get in the elevator, lay in the middle of the elevator and cover up with a blanket, when someone comes in tell them to get out of your home.
Go to the movies, sit in the very back and throw skittles at the back of random people's heads. When they look back point up to the ceiling.