This adrenaline-pumping tour combines mountain biking and packrafting for a full day of outdoor adventure. First, ride down on an old mining road, losing more than 1,000 feet (305 meters) in elevation. At the bank of the Green River, inflate your packraft, strap on your bike, and float down an especially scenic section of Labyrinth Canyon. Back on land, bike another three miles to wrap up the day.