Counting your cubes before they melt is the key to success in this cool-off game.
For each team, nestle a large plastic bowl or a small pail in the center of an inflated pool doughnut and set it afloat in the pool.
Once everyone's in the water, dump a large bag or two of ice cubes into the center of the pool.
The team that gets the most cubes in its bucket within three minutes wins.