(Nate Carlisle | The Salt Lake Tribune) The Slickrock Trail in the Needles District of Canyonlands National Park has three designated viewpoints. (Tribune File Photo) Hikers are dwarfed by the tall red spires as they descend the the Wall Street section on the Navajo Loop Trail, the most popular trail in Bryce National Park. Admisison is free to all national parks on Veterans Day weekend. (Tribune file photo) The view of Angels Landing from Scout Lookout in Zion National Park. (Courtesy photo) Visitors hike in the Fiery Furnace in Arches National Park on May 24, 2009. The Fiery Furnace in Arches National Park, seen here on May 24, 2009, requires a permit to enter. Photo courtesy María Villaseñor. (Tribune file photo) Hikers walk along the Peakaboo Trail in Bryce Canyon National Park. One of The Windows can be see above. ((Nate Carlisle | The Salt Lake Tribune) ) The Neck Spring Trail in the Island In the Sky District of Canyonlands National Park provides great views of the park's cliffs as well as Shafer Canyon. ((Nate Carlisle | The Salt Lake Tribune) ) The Neck Spring Trail descends out of a drainage in the Island In the Sky District of Canyonlands National Park. (Nate Carlisle | The Salt Lake Tribune) A cairn marks the Slickrock Trail in the Needles District of Canyonlands National Park. (Tribune file photo) Hiking Grand Wash trail in Capitol Reef National Park.