Beach Ball Race- kids work together to hold beach ball between their backs for the first leg of the race, then their sides, then elbows. The field Day Challenge is halfway down on web site includes water relay, tricycle race, and tug-of-war.
This post has a water themed Birthday party including this relay: The first kid starts with a full cup of water, then pours it over his head and the second kid catches it and repeats and they keep doing this to see who can fill up a jar the fastest.
I love this idea for the backyard - kids and entertaining. tic tac toe garden table, diy home crafts, outdoor living, repurposing upcycling, tic tac toe tree trunk table with stones painted as bees and lady bugs