Carbon River & Mowich Area Trails. A portion of the Pacific Crest Trail weaves in and out of Mount Rainier National Park along the park's eastern boundary, from Chinook Pass in the north down to Laughingwater Creek in the south (near Three Lakes). Please note that there are no established backcountry camp sites within the park along the Pacific Crest Trail. Camping is permitted on adjacent United States Forest Service lands. For information regarding public lands that require permits, consult the Pacific Crest Trail Association permits page. For more infomation about hiking the portions of the Pacific Crest Trail in the park see the Naches Peak Loop Trail. Learn more about the Pacific Crest Trail at pcta.org. Trails of Mount Rainier - Mount Rainier National Park (U.S. National Park Service)