Ask parents to set up hose sprinkler in backyard and get your swimsuit on.
Have one person playing music [away from wet area].
When the music is playing dance away running through the sprinkler!! When music stops [person doing music stops musics] you must 'freeze' like a statue! If you are stuck under the sprinkler you can't move til the music starts again!
Make sure you give the person playing the music a chance to get wet too!!