Camping
There are two campgrounds within the main section of the park:
Watchman Campground
Open year-round. This campground offers sites on a first-come, first-serve basis from November through March, while reservations may be made up to five months in advance during the rest of the year (http://www.recreation.gov...).
South Campground
Open March-October. All sites in the South Campground are first-come, first serve. If you're willing to not make any reservations, see if you can get a site here instead of at Watchman, since the campsites generally have more shade and are closer to the Virgin River.
Both of these campgrounds provide restrooms, picnic tables, RV dump, drinking water and utility sinks.
Lava Point
In the Kolob Terrace section of Zion, there are six primitive sites at Lava Point. The sites are usually open from June to November, but the road will close in the winter due to snow. There is no water at the campground.
Lodging
Zion Lodge
The lodge is open year-round and has 40 cabins and 80 motel rooms. Cabins include two double-size beds, full bath, and fireplace. Motel rooms include either queen-sized beds or a single king-sized bed, air conditioning, and full bath. The restaurant and cafe here are the only options within the park.
There is only one lodge within the park. The towns of Springdale and Mount Carmel Junction are located just outside of the park and have numerous places to stay, as do further afield towns such as Hurricane and Apple Valley.
backcountry
All backcountry camping requires a permit, which is available for a fee at the visitor center. Maximum group size for backcountry usage is twelve people.
Walk-in permits are issued the day before a canyoneering trip. Backpacking permits are issued up to three days prior to the trip date. Permits given out are limited and issued only when the backcountry desk at the visitor center is open. Express Permits allow participants to obtain a permit on-line. Sign-up every three years is required and must be in person and at the backcountry desk. Due to the popularity of the "Subway" and Mystery Canyon, a lottery has been setup to dole out permits for these two technical slot canyons.
Reservations can be revoked in the event of adverse environmental conditions such as flash flood danger. Hikers are required to obtain a permit in person at the backcountry desk the day before or day of a hike.
Pristine Zones allow up to 12 people, and hiking/canyoneering in these zones usually requires technical gear and equipment: Mystery Canyon, Imlay Canyon, Kolob Canyon, Behunin Canyon, Heaps Canyon , Echo Canyon, Spry Canyon, Englstead Hollow, Bulloch Canyon, Ice Box, and the Upper Right Fork of North Creek.
Primitive Zones allow up to to fifty visitors: Orderville Canyon, Pine Creek Canyon, Keyhole Canyon, and the Subway.