Even though still not nearly as exciting as going over a waterfall in a barrel (well, The Insano maybe) our friends at Oobject have compiled 12 excellent examples of these slippery slopes.
Amusement Park, Taiwan Somehow, this achieves the effect of tilt shift without it being so.
Atlantis Resort, Bahamas 27m, straight down.
Backyard waterslide simulator
Big drop, Oakwood Lake - Manteca, California
Down the drain, Calypso Park, Ontario
Gleneig, Adelaide, Australia
Great Wolf Lodge
Leo Lafleur, Kingston Ontario
The Insano, Beach Park, Brazil
The Tornado, Six Flags America
Water slide in the Grecht waterway, Holland Something surreal about this, like a post modern Dutch landscape painting.