Many packs enjoy a summertime Raingutter Regatta. You can download this certificate at this link. A great song to sing at your Raingutter Regatta is sung to the tune When Johnny Comes Marching Home, and the lyrics are found on the 2nd page of the June 2008 Program Helps (right column. Heading: "Song: Regatta Day). Just click here: lyrics.
Have you tried a Vegetable Regatta? Slice the top off of a bell pepper, gourd, zucchini, or other vegetable. Hollow the middle with a spoon. Add a shishkabob skewer or two and a piece of paper for a mast. Test the floatability and mobility in a sink or tub of water.