I really, really, really like this idea. There was a ride in King's Island, in Cincinnati, I'm assuming it's still there, called Amazon Falls. Basically, it's a boat similar in style to the Jurassic Park boats at IOA, and really it's just a trip up a hill, then you ride through some "rapids" and go down a huge waterfall. It's fun, but I remember thinking to myself, man... imagine if they really stretched this out and gave it some amazing theming. I can only imagine what Disney could do with a ride like that.