There are backpacking opportunities galore here, and several of the day hikes discussed can be more comfortably done in 2 or more days. In addition to the park's established trails and the famous Narrows, there are a number of off-trail routes for those experienced in the use of compasses and topographic maps -- get information at the Zion Canyon Visitor Center. Backcountry permits are required for all overnight hikes in the park as well as for slot canyon hikes. Permits cost $10 for one or two persons, $15 for three to seven, and $20 for 8 to 12 people. You can purchase a backcountry permit at the visitor center the day before or the day of your trip, and reservations for permits can be made in advance through the park's website, www.nps.gov/zion, although they must still be picked up in person at the visitor centers. You can get permits at Zion Canyon Visitor Center (tel. 435/772-3256), near the south entrance to the park, or at Kolob Canyons Visitor Center (tel. 435/586-9548), in the northwest corner of the park off I-15. Backcountry camping is not permitted within 1 mile of a road or trail head.