They're twisty and you can climb for hours. But there are also some wild downhills for the speed-hounds. Wanna-be sledders race down the one and a half mile Alpine Slide at Park City Mountain Resort in Park City, Utah. Now there's something for all levels and age groups. With the help of local bike shops, the two resorts have built more than 100 miles of marked trails during the past five years.
Maps illustrating the routes are available around town.
But not all summer visitors come for the biking. Believe it or not, many are on business trips. There's so much to do. If physical activity isn't your thing, don't worry. You can attend Aspen's 51st annual classical Music Festival or Sun Valley's Ice Shows, with performances by Olympian Katarina Witt and others.