Tucson, in southern Arizona, is the place to cowboy up and horseback ride the trails through the stunning High Sonoran Desert—or you can also blast down trails on a mountain bike. The spectacular beauty of the desert here is compelling, and its wide-open wonders can be seen in the stately saguaro cacti at Saguaro National Park. The world’s largest cacti, the saguaro are found only in a small portion of the United States. Head to Mt. Lemmon to see the incredible rock formations and vistas and then hike the cascades of Seven Falls at Sabino Canyon.