Chance got into it by picking up whatever he could find, which was generally sticks and rocks, and throwing it in the garbage bag.
Chance also spent a fair amount of time watching the airplanes. We were right in the path of the planes flying into the Oakland airport, so they got pretty close, and he was loving it! Chance loves airplanes! No matter where we are at, inside or out, as soon as he hears an airplane, he perks up and starts with his airplane imitation. He will pretend his hand is a plane and fly it around while he makes the engine sounds. Everytime he saw a plane out there he would point to it and watch it until he couldn't see it anymore.
Just adventuring off in the grass that was taller than he was.