Here's everything you need to know to plan a trip to Arizona's Petrified Forest National Park.Petrified Forest National Park in Arizona.Credit: Carlo Alberto Conti/Getty ImagesA scenic audio tour by car is one of the best ways to explore Petrified Forest National Park, the only national park in the U.S. that contains a section of Historic Route 66.Take in jaw-dropping views of the Painted Desert, a colorful expanse of hills, buttes, and mesas.Hi…