When hiking loses its allure, add some altitude and a quicker pace. Run this 120-mile route—solo or as part of a team—which treks through the Rockies from Buena Vista to Beaver Creek. Tents, showers, and beer will be waiting at each campsite. Don’t forget your water-resistant jacket, warm hat, gloves, and emergency blanket; organizers won’t let you past the starting line without them. Tue-Wed 8:30 a.m.; Thu-Sun 8 a.m.