What You'll Need: An inner tube, a river, and a vibrating cock ring.
How To Play: Find a semi-secluded spot along the river and strip down. Have your partner lay down on an inner tube and put on the cock ring. Climb on top of him and start having sex as you float downstream. The inner tube provides a nice bouncy foundation for thrusting (not to mention a great angle for penetration), and negotiating whitewater rapids while having sex will guarantee a class 5 orgasm!
Adventure Rating: 9