- Rent an inflatable Water Slide
- Make a slip and slide
- Super Soaker Free for All: Let each group shoot each other with the water guns until the water runs out then switch with another group.
- Get some portable lawn sprinklers and just leave them on and let the kids run around through them.
- Fire Hose: If you have a good relationship with your local Fire Department, they will be happy to swing by camp and flip on the water hose to soak the kids!
- Water Ball Catch: Get a bunch of water balls (squish balls for the pool that hold water). Leave them out with a bin full of water and let the kids run around and play catch with them.