Nintendo Wii Outdoor Challenge
The Nintendo Wii Active Life Outdoor Challenge is a great rainy day game to keep kids active inside the house.
My kids are addicted to the dozen or so Wii games on the disc included. The games are all played on a mat (also included) that has the kids vigorously using their arms and legs.
Great gift idea in the $50 range for somebody who has the Wii. I play the games all the time, too.