Two teams, each defending a goal line. The object is to get the watermelon to touch the enemy's goal line. The melon cannot be carried. Hold in shallow water. Each patrol competes against all others, then winners against winners and losers against losers.
Wrapped caramels work well.
Boys who retrieve the largest number of sweets are the winners. This is a water version of British Bulldog. On signal, each patrol tries to swim from one side of the circle to the other without being touched by Jaws. When caught, a boy joins Jaws. Continue crossings until time is called.