J.S.
Eating contests? Most watermelon seeds, plate of whip cream, etc.
My girl scout loves to play 'chubby bunnies'-each person puts one marshamllow in her mouth and says chubby bunny. Conitinue adding marshmallows and speaking to see who can fit the most. This should be done with older kids.
Another one was a form of hot potato. Wrap a small prize in a brown bag.Put it another bag and write a silly task on the outside. Add another bag and another silly task. Use as many bags as you like. Tasks can include singing your ABC's, sommersaults, tell a joke. Play music. When the music stops, whoever is holding the bag removes the previous bag and does what it says. The person who gets the bag lasts keeps the prize.
Go to familyfun.com. They have so many game ideas! Like the above mentioned games.
****another idea****
Newspaper fashions. Provide kids or grown ups with newspapers, tape, scissors and rope along with any nature items they find. Each team makes some sort of outfit using these items. The design must be able to come on and off. Have a fashion show at the end and pick the winner by applause.