On Labor Day, just inside the Ballard Locks entrance, Brittany Rupert, 16, of Gold Bar, performs a trick on her unicycle called "wheel walking." She propels the unicycle pushing the wheel forward with her foot, without using the pedals. A sign posted nearby reads "Walk your bicycles," and although she is not riding a bicycle, the park ranger, pictured right, spots her and in a moment will politely ask her to walk her vehicle.