Have a bakery make a Disney themed cake, you know, with all the characters, a castle, give the bakery a few disney mini-toys to use also. (On your next trip to disney, buy the tiny rubber characters, Mickey, Goofey, Pluto, etc. and decorate your own cake.) Give everyone in your group a brightly colored tee=shirt and fabric markers,and have everyone decorate their own tee-shirt to wear in the parks. Also a good idea to wear them so you can find one another! have everyone contribute to the "I dare you" fund. Pick the one or two people in your group who absolutely refuse to get on Splash mountain, or Tower of Terror, and when they finally do, they get the money!