VAIL, Colo. -- Two 12-packs and a raft bought at Wal-Mart by three 19 and 20-year friends were no match for Class III rapids on the upper Colorado River between Radium and Rancho Del Rio. One man, Thomas Williams, nearly drowned when the raft overturned last Sunday. He was rescued by a nearby rafting guide. "I was under for so long I just blacked out," Williams told the Vail Daily. "I didn't realize I was being dragged along by the river." Class III rapids, on a scale of 1 to 6, include a large continuous set of waves with small...