Great site by the way. Lots of good stuff. I'll e-mail some other ideas you may consider adding. We have a fantasy contest using play money from some old board game. And we go shopping.
Every purchase is written down and the money put away.
The goal is to try and spend all of it. It also makes you feel childish and therefore has to be fun. I especially find it to be a great non-conformist escape in the winter months around here. How about the basement or living room. Just move everything in the room up against the walls and pitch a tent.