Stick the stake in the ground.
Measure 3 feet from the stake and stick a peg in the ground.
Place another peg every 3 feet in a line out from the stake.
Starting at the closest peg, the first scout throws a ball at the stake. If he hits the stake, he moves on to the next farther peg for his next turn. If he misses, he stays at the current peg for his next turn.
After throwing a ball, that scout retrieves the ball and gives it to the next scout waiting to throw. With a few balls, there should be very little waiting.
The first person to progress all the way to the last peg and hit the stake from there wins the round. Play as many rounds as the scouts want or until it's dinner time.