Give each group a certain number of the largest trash can bags you can find and some tape/rope etc. See who can build the strongest raft and then race across the width of the pool.
Added by Eben in South Africa
Jonathan McKee
Jonathan McKee is the author of over twenty books including the brand new The Guy's Guide to FOUR BATTLES Every Young Man Must Face; 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.