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.
Donuts on a String Game - Tie powdered donuts on a string for a fun game. If you can't find powdered donuts, or just want to have way more fun, add extra powdered sugar to the donuts before you hang them.
Bachelor and bachelorette party together. Guys and girls do their own thing in the morning meet up in a field play some competition games filled with dares for the bride and groom. Completed with a Bon fire and maybe camping.