Participate in a soapbox derby race.

Build a gravity-powered vehicle from scratch and race it down a hill in an organized soapbox derby, where creativity matters as much as speed. The real fun is in the engineering challenge - designing something that's fast, stable, and hopefully won't fall apart mid-race. Whether you go for aerodynamic efficiency or outrageous theme, you'll join a community of amateur engineers who take cardboard and wheels very seriously.