With classes available for climbers as young as 5, Joshua Tree is the ideal family vacation for rock climbers. The sunny, arid desert climate almost guarantees beautiful days, though you'll want to be sure to bring water bottles. If it's your kids' first time climbing, consider taking them to a climbing or bouldering class near home to make sure they are comfortable with the sport and have a healthy (but not overwhelming) fear of heights. In addition to scaling the rock formations, there's hiking, horseback riding, camping, mountain biking, geology tours and a wide-open sky for stargazing.