The National Parks hosted more than 281 million visitors in 2010. Of this number, most explored the park from inside their cars, while many others only stopped at the major scenic overlooks. In this useful, innovative guide, writers who are very familiar with the parks as well as insiders - including rangers, superintendents, and longtime visitors - reveal their secrets about the national parks that will entice you out of your car and beyond the well-trodden tourist trail.