Here's a silly group icebreaker that will cool players off in a hurry.
Fill up the pool and dump in several trays, or a bag, of icecubes. Players then sit around the edge of the wading pool with their feet poised over the water.
At the word "Go," players race to move the cubes out of the water and into their bowls within a designated time period. The catch is, they can only use their feet.
The winner by a foot, of course, is the person who has the most ice cubes in his bowl when the time is up.