Among the 10 wildest water parks in America is Schlitterbahn, where one of the highlights is the Master Blaster water coaster—its uphill water-propelled technology (patented by Schlitterbahn) has been adopted by 100 water parks worldwide. The New Braunfels park also hosts the world's first surfing machine, Boogie Bahn. Schlitterbahn (German for "slippery road") operates three water parks in Texas and is opening a resort in Kansas City, Kan., next summer that will include a saltwater marine park for diving, miles of tubing waterways, and its own Master Blaster. But New Braunfels—on the site of the spring-fed Comal River—is Schlitterbahn's flagship Bavarian-themed water park. With more than 40 rides, the park introduced another full-immersion ride on Memorial Day weekend: The Dragon's Revenge.