An extensive backcountry trail system covers more than 300 miles and courses over high-altitude, avalanche-prone terrain, requiring you to break trail, with skins. All 30 huts are outfitted with a spacious kitchen, shared dining, and sleeping quarters. Sign on to Paragon Guide's challenging six-day, 40-mile trek from Vail to Aspen. They cache sleeping bags and the bulk of the food at the huts, so you'll be toting a relatively light backpack. No trail fees. []