Skyline Drive. This is a dirt road stretching 75 dirt miles at 10,000 feet. The Skyline Drive is the alpine equivalent of the White Rim Trail -- a multi-day bike ride on dirt road with incredible views. Perfect for a scout troop to ride their bikes to the next camping spot on a 3 or 4 day trip. It's possible to ride the whole thing in one day, but certainly not easy. You'll need a support vehicle, strong lungs, and iron legs.