Explore! Joshua Tree National Park : From the hot Sonoran Desert in the east to the cooler Mojave Desert in the west, Joshua Tree National Park offers diverse landscapes, picturesque rock formations, and exciting opportunities for adventure. Explore ruins of a mining mill at Wonderland Ranch, discover panoramic views from Ryan Mountain, and hike or bike among some of the largest Joshua trees in the park at Upper Covington Flat. Explore! Joshua Tree National Park shows you all the best outdoor activities in the park. Look inside to find: a fold-out color map of the park, complete with trails; where to camp, hike, bike, and drive; trail descriptions and accurate directions; local hazards and safety precautions.