More than 65 million people visit the national parks annually-and overcrowding has become a serious problem. So we sent our authors out to hit the trails and campsites to figure out how to beat the crowds and enjoy an unspoiled experience of nature. Our authors take you to the most spectacular landscapes in the western U.S. and provide advice for every kind of park visitor, from the day-tripper who wants to see the highlights quickly to the back-country...