A network of singletrack and dirt roads snakes alongside Copper Canyon's lichen-covered walls. This is the wild homeland of the Tarahumara Indians, which makes for a rare cultural mountain-biking experience. Don't just stick to the traditional rim route, which follows the scenic train line from Creel: The best riding is deeper in the canyon. Hire a guide to show you the way – and steer clear of the 9,000-foot climbs. To set up a tour, email the folks at Aventura Pantera. [aventurapantera.com.mx]