Inflate an air mattress and see how many kids can stand up straight on it in the water without falling over. For more fun, do not inflate it all the way. You could also give a prize to the person who stays on the longest, etc. If you have a fairly small group, you can have everyone play, and if your group is larger, then use this as an up-front game.
Safety Note: Have adult spotters around the pool. Don't allow pushing. Also, avoid using a small pool, where students have a chance of falling into the side of the pool.
Added by Eben in South Africa
Jonathan McKee is the author of over twenty books including the brand new The Bullying Breakthrough; The Teen’s Guide to Social Media & Mobile Devices; If I Had a Parenting Do Over; and the Amazon Best Seller - The Guy's Guide to God, Girls and the Phone in Your Pocket. He speaks to parents and leaders worldwide, all while providing free resources for youth workers on TheSource4YM.com. Jonathan, his wife Lori, and their three kids live in California.