E and I saw a pin from this article, where you make a waterway out of foil in which to float and race your boats. We headed out to the backyard this afternoon, made a couple styrofoam boats, rolled out the foil, and started the water hose. E decided that his new Army men might want to ride in the boats. It wasn't long before we found out it worked a lot better to just slide the army men, and not mess with the boats at all. What a fun activity! And, he'll be playing with it again and again throughout the next couple days.