Join a park ranger on a two- or three-hour walk through a labyrinth of rock fins and narrow sandstone canyons. You'll see arches that can't be viewed from the park road and spend time listening to the desert. You should be relatively fit and not afraid of heights if you plan to take this moderately strenuous walk. Wear sturdy hiking shoes, sunscreen, and a hat, and bring at least a liter of water. Walks into the Fiery Furnace are usually offered twice a day (hours vary) and leave from Fiery Furnace Viewpoint, off the main road, about 15 miles from the park visitor center. Tickets for the morning walks must be reserved up to six months in advance (at www.recreation.gov) mid-March–October, or purchased at the visitor center November–February. Tickets for afternoon Fiery Furnace ranger-led walks must be purchased in advance at the park visitor center, ideally as soon as you arrive in Moab and at least a day or two ahead. Children ages 7–12 pay half price; the walk is not recommended for children under 5. Book early as the program usually fills months prior to each walk.