Desert Race Across the Sand This six-day ultra, the U.S.'s version of the Marathon des Sables, covers 148 miles of Moab's trails. Runners must carry an antivenom pump.
Red Bull King of the Air With Maui's strong side-shore winds, pro kiteboarders can fly as high as 40 feet. Susi Mai (right), 20, defends her title.
Gauley River Festival Every fall the Summersville Dam releases roller-coaster-sized rapids on West Virginia's Gauley River, drawing 5,000 eager paddlers.
Goofy Versus Regular Which stance is better? The goofies put their best (right) foot forward against a team of regulars in Lake Forest, Calif.
DAVID POU/RED BULL