Build a throne out of pioneering poles, sit someone on it, and race it round an assault course with a cup of water on the person's head!
Poles and ropes
Line the two long ones up, parallel, 18 inches apart, and lash the two shorter ones perpendicularly to make a seat. Then sit someone on it and go through an assault course. You could even make part of the course so small that they have to dismantle the throne, pass it through, and re-lash it.