Bighorn sheep may be your only trail companions in the wilderness of J-Tree's northeast section. This 15-mile walk brings you into the ecological transition zone where the Mojave and Colorado deserts meet. Park on Highway 62 and walk 4.5 miles along a wash as you make your way into a canyon of boulders and pour-offs, and from there it's a scramble into the peaks of the Coxcomb Mountains. You'll need a map, compass, and backcountry skills to find your way to the summit of 4,416-foot Aqua Peak, but the panoramic views make it worthwhile.