Every kid loves playing with the hose. Why not let the kids spray each other and have water fights to cool off in the heat. This is a favorite activity at our house. We get the occasional sad face, but mostly just laughs. This could also be used at a party by filling up a kiddie pool with water and let the kids run around with water guns, or spray the trampoline with water for a slippy tramp. There are so many funny sprinklers to hook up to the hose and let go wild.