Whether you"re a leisurely day walker or a hardcore hiker, there"s a US National Trail with your name on it. Thankfully the trails in the national network are categorized as "Scenic," "Historic," or "Recreational" to simplify things. Probably the most famous pathways are the Appalachian Trail and the Pacific Crest Trail (both designated "Scenic" trails), which were the first to be officially named to the National Trails System when President Lyndon B. Johnson signed the system into law in 1968.