Especially if you are staying in the Jumbo Rock campground (we haven’t seen any of the other campgrounds in Joshua Tree, but we loved this very much), this is a great sunset hike, a nice way to wrap up the day. We hiked the Lost Horse Loop in the morning (link) , went back to the campground to relax a bit and hiked these three loops right before sunset. Wise choice since being very popular and easy treks during the daytime they get quite crowded, especially with families and young kids. They are all very short (1.7 miles Skull Rock, 0.7 miles Discovery trail, 1.9 miles Split Rock) and they are all connected to each other starting right in front of the entrance of Jumbo Rocks campgroung and ending inside of it, so you don’t even need to take a car.