The Tarzan Boat is a boat with a bunch of jumping platforms and trampolines and rope swings and a slide attached. Sadly, there is no circus cannon. It still looks like a great time though. Unfortunately, they cost $65,000 and up, making it far more cost effective to score some acid, a kiddie pool, and some of those giant foam noodles. Trust me, you won't know the difference.
Hit the jump for a commercial for the thing. It's a shame they didn't make it look like a pirate ship.
Thanks to Taylor A, who agrees there should at least be a catapult or trebuchet you can ride.