Regulations
The theme in the backcountry is "leave no trace," and that means packing out any garbage you take in, not taking pets, and avoiding leaving scars on the landscape by staying on designated trails and reusing existing, designated campsites. Fires are allowed only in established fire rings, and only dead and downed material may be used for firewood; fires are prohibited in some areas, but backpacking stoves are allowed throughout the parks. You must have a park permit for overnight stays in the backcountry. The complete list of do's and don'ts is available in the Backcountry Trip Planner, available at most visitor centers. For more information on "leave no trace" ethics, see www.lnt.org.
Backpacking for Beginners
Be sure to wear comfortable, sturdy hiking shoes that will resist water if you're planning an early-season hike; cotton socks are not a good idea because the material holds moisture, whereas wool and synthetics, such as fleece, "wick" it away from your body. Your sleeping bag should be rated for the low temperatures found at high elevations; if you bring a down bag, keep it dry or suffer the consequences. Most campers are happy to have a sleeping pad. The argument rages about the merits of old-fashioned, external-frame packs and the newer, internal-frame models. Over the long run, the newer versions are more stable and comfortable, but a big frame pack can shoulder bigger loads. Good padding, a lumbar support pad, and a wide hip belt are pluses. Be sure that you've tried out the pack -- wear it around the house! -- before you take it on a long trip with heavy loads, so that your body and the pack frame have a chance to adjust to each other.
Personal Safety Issues
It's best not to backpack alone, but if you must, be sure that you have told both park rangers and friends where you'll be and how long you'll be gone. Don't leave the parking lot without the following gear: a compass, topographical maps, a first-aid kit, bug repellent, toilet paper and a trowel of some sort, a flashlight, matches, a knife, a rope for hanging food supplies in a tree, and a bell or other noisemaker that hopefully will alert any bears in the neighborhood to your presence, as well as a tent, a stove, and a sleeping bag. At this altitude, sunscreen and sunglasses with UV protection are a wise addition. A recently developed bear repellent generically referred to as "pepper spray," available in most sporting goods stores, has proven successful in countering bear attacks. You'll also need iodine pills or a good water filter because that seemingly clear stream is filled with parasites that are likely to cause intestinal disorders. If you don't have iodine or a filter, boil water for at least 5 minutes before you drink it.