How to play: Form two lines of even teams for a relay hula hoop race. Have an adult stand in the middle of the pool holding a hula hoop out on both sides. Players swim through the hoops, do a somersault to flip around, and swim back through the hoop to tag the next player. The first team to all swim through the hoops wins. If guests have a mermaid tail, have them race in their tails. If not, then depending on the level of skill, party guests can either swim or use water noodles or kick boards to move across the pool and through the hoops. Mix up the level of swimmers to make the teams as even as possible.