The Raingutter Regatta is somewhat like the Pinewood Derby. You get a kit with the structure of the boat and two strips of wood. You carve the wood into a shape that will help your boat run smoothly that you put on the sides of your boat to float on. You also get a mast and sail to put on the boat and during the races you blow a straw at the sail to make it go.
Here are some pictures of Raingutter Regatta boats.
This is a picture of a Raingutter Regatta happening.