Wrestle for Candy
Thanks very much to Joanne Moodhe, who posted this activity to the Guiding Mailing List!
Pair the girls off to arm wrestle. The winner gets to have the loser feed them a piece of candy (or fruit, whatever you choose as the prize). If they fight against each other, neither will get much candy, but if they catch on and work together on win and lose, each gets more candy by working together instead of against the other.