For a truly immersive whitewater experience, try "River Boarding," where you swim the rapids with a modified "boogie board" and flippers. River Boarding is a great way to feel the flow of the river and surfing a standing wave is a ride like no other. A single instruction session is required; after that you can simply rent the gear and "board" the rapids on your own. All participants should arrive 1/2 hour before their trip time for check in.
You must be 16 years or older and in good physical condition to participate. This is a very strenuous activity!