SNOWMASS VILLAGE, Colo. -- "River rafting? Horseback riding? At Snowmass?" said Larry behind the counter at the Ski Chalet, in Los Angeles.For most people, just hearing a ski resort name -- Snowmass, Steamboat, Copper Mountain, Winter Park, Vail, Taos -- is a vacation turn-off. Winter winds, cold feet, blistering snow storms? No way."Snowmass? That's for skiers," he told me. "Not where I want to be on my summer vacation."