Ideas for making an obstacle course?

Question

I want to build an obstacle course for my friends, my brother, and me, but I don't know what the obstacles should be. I have a patio, a reasonably sized backyard thats kinda hilly, and a pool (18 ft x 4 ft) at the bottom of the hill.

A picture of the pool is here (It's the offical pool company site):

http://www.intexcorp.com/easyset.htm

It's the last one on the bottom.

Ideas can involve the pool, but please include ideas that don't involve the pool, just incase someone doesn't want to go in it. Stuff like balls, chairs, towels, sponges, etc. can be used. Wood, tools, screws, and nails can NOT be used. All of the people using the course will be ages 12-14.

Thanks for everyone's input!

Answer 1

i know a little about obstacle courses, i spent a month in navy seal camp, and played football and wrestling in high school, try putting tires on the gound and running through them.