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Air Tours

Black Hills Balloons. Based in Custer, Black Hills Balloons provides amazing bird's-eye views of some of the Black Hills' most picturesque locations. Reservations are essential. 25173 Lower French Creek Rd., Custer, South Dakota, 57730. 605/673–2520; www.blackhillsballoons.com. From $295.

Bicycling

Bicycles are permitted only on designated roads, which may be paved or unpaved. They are prohibited from closed roads, trails, and the backcountry. Flat-resistant tires are recommended.

Sheep Mountain Table Road. This 7-mile dirt road in the Stronghold Unit is ideal for mountain biking, but should be attempted only when dry. The terrain is level for the first 3 miles, then it climbs and levels out again. At the top you can take in great views of the area. Badlands National Park, South Dakota.

Outfitters

Two Wheeler Dealer Cycle and Fitness. Family-owned and -operated Two Wheeler Dealer Cycle and Fitness, based in Spearfish, stocks more than 1,000 new bikes for sale or rent. The service is exceptional. Get trail and route information for Badlands National Park and the Black Hills at the counter. 305 Main St., Spearfish, South Dakota, 57783. 605/642–7545; www.twowheelerdealer.com.

Hiking

The isolation and otherworldliness of the badlands are best appreciated with a walk through them. Take time to examine the dusty rock beneath your feet, and be on the lookout for fossils and animals. Fossil Exhibit Trail and Cliff Shelf Nature Trail are must-dos, but even these popular trails tend to be primitive. You’ll find bathrooms at Fossil Exhibit Trail. Both trails feature boardwalks, so you won’t be shuffling through dirt and gravel.

Because the weather here can be so variable, rangers suggest that you be prepared for anything. Wear sunglasses, a hat, and long pants, and have rain gear available. It's illegal to interfere with park resources, which includes everything from rocks and fossils to plants and artifacts. Stay at least 100 yards away from wildlife. Due to the dry climate, open fires are never allowed. Tell friends, relatives, and the park rangers if you're going to embark on a multiday expedition. Assume that your cell phone, if you’ve brought one, won't get a signal in the park. But most important of all, be sure to bring your own water. Sources of water in the park are few and far between, and none of them are drinkable. All water in the park is contaminated by minerals and sediment, and park authorities warn that it's untreatable. If you're backpacking into the wilderness, bring at least a gallon of water per person per day. For day hikes, rangers suggest you drink at least a quart per person per hour.

Easy

Fossil Exhibit Trail. The trail, in place since 1964, has fossil replicas of early mammals displayed at wayside exhibits along its ¼-mile length, which is now completely wheelchair accessible. Give yourself at least an hour to fully enjoy this popular hike. Easy. Badlands National Park, South Dakota.

Window Trail. This 200-yard round-trip trail ends at a natural hole, or window, in a rock wall. Looking though, you'll see more of the distinctive badlands pinnacles and spires. Easy. Badlands National Park, South Dakota.

Moderate

Castle Trail. This hike stretches for 5½ miles one-way from the Fossil Exhibit trailhead on Badlands Loop Road to the parking area for the Door and Windows trails. If you choose to follow the Medicine Root Loop, which detours off the Castle Trail, you'll add ½ mile to the trek. If you plan to walk the entire trail, give yourself three hours—slightly more if you want to take extended breaks. Experienced hikers will do this one more quickly. Moderate. Badlands National Park, South Dakota.

Cliff Shelf Nature Trail. This ½-mile loop winds through a wooded prairie oasis in the middle of dry, rocky ridges and climbs 200 feet to a peak above White River Valley for an incomparable view. Look for chipmunks, squirrels, and red-winged blackbirds in the wet wood, and eagles, hawks, and vultures at hilltop. Even casual hikers can complete this trail in far less than an hour, but if you want to observe the true diversity of wildlife present here, stay longer. Moderate. Badlands National Park, South Dakota.

Door Trail. The ¾-mile round-trip trail leads through a natural opening, or door, in a badlands rock wall. The eerie sandstone formations and passageways beckon, but it's recommended that you stay on the trail. The first 100 yards of the trail are on a boardwalk. Even a patient and observant hiker will take only an hour here. Moderate. Badlands National Park, South Dakota.

Notch Trail. One of the park's more interesting hikes, this 1½-mile round-trip trail takes you over moderately difficult terrain and up a ladder. Winds at the notch can be fierce, but it's worth lingering for the view of the White River Valley and the Pine Ridge Indian Reservation. If you take a couple of breaks and enjoy the views, you'll probably want to plan on spending a little more than an hour on this hike. Moderate. Badlands National Park, South Dakota.

Difficult

Badlands Wilderness Area. If you want a challenge, you might consider trekking this 100-square-mile parcel of grassy steppes and rocky canyons east of the highway and south of Sage Creek Rim Road, near the Pinnacles entrance. There are no services here and very few visitors, even in summer. Before venturing out, check in with park staff at one of the visitor centers. Difficult. Badlands National Park, South Dakota.

Saddle Pass Trail. This route, which connects with Castle Trail and Medicine Root Loop, is a steep, ¼-mile climb up and down the side of "The Wall," an impressive rock formation. Plan on spending about an hour on this climb. Difficult. Badlands National Park, South Dakota. www.nps.gov/badl.

Horseback Riding

The park has one of the largest and most beautiful territories in the state in which to ride a horse. Riding is allowed in most of the park except for some marked trails, roads, and developed areas. The mixed-grass prairie of the Badlands Wilderness Area is especially popular with riders. However, note that the weather in the Badlands Wilderness Area can be unpredictable. Only experienced riders or people accompanied by experienced riders should venture far from more developed areas.

There are several restrictions and regulations that you must be aware of if you plan to ride your own horse. Potable water for visitors and animals is a rarity. Riders must bring enough water for themselves and their stock. Only certified weed-free hay is approved in the park. Horses are not allowed to run free within the borders of the park.