On a hot day nothing is more refreshing than water, for both drinking and playing. Toddlers and pre-schoolers might enjoy a wading pool (never be more than an arm’s length away from a child in a wading pool); children of any age can enjoy running through a sprinkler. School age children would enjoy shooting targets with a water gun, or a water gun fight. For children up to about age six, a large paintbrush and a pail of water can keep them happy and busy as they ‘repaint’ the house. If you have a sandbox, adding some water to it creates new options for pre-schoolers.

Find more water fun at  http://www.ehow.com/how_2324761_play-fun-water-games.html