Allow a group of teens to set up the wet and wild obstacle course. Give them some water game ideas, like our wet t-shirt relay and let them incorporate the ideas into their course. They should understand the rules of the race and know if it will be one or two people racing at the same time.
If you want to make this a weeklong event and you have enough teens, try this: each unit of teens creates an obstacle course, one each day. Then at the end of the week, you vote on the best Wet and Wild Course. Winners get wet?