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.
Add a fruit, a juice box, No GMO chip bag, and a sub sandwich. Place large blankets down on the grass and have a group picnic. Food served in beach-pail. this would so cool if your kid had a birthday at the beach--indoor beach party?