Literally the most fun you could possibly have in the Phoenix area during the summer. It's very convenient and well worth the fifteen dollar cost of a tube rental. Get a group together, fill a cooler with beers, tie your tubes together, and catch some rays on teh River. Over Memorial Day weekend someone had the genius idea to bring hundreds of marshmallows and start a harmless and ridiculously entertaining food fight with neighboring floaters. TRY IT if you haven't already.