The groomed ski runs at Deer Valley are legendary - as soft and symmetrical as corduroy. It's not surprise, then, that the mountain bike trails feel equally manicured. "We actually get out and rake the runs," says Steve Graff, the resort's mountain bike manager. Located just outside Park City in Utah's Wasatch Mountains, Deer Valley opened its lifts to bikes in 1992 and has been adding to its network of trails ever since. More than 40 runs spiral down from three peaks.