The first place to stop at Wind Cave National Park [1] is the Wind Cave Visitor Center (26611 U.S. 385, 605/745-4600, www.nps.gov/wica [2], mid-June–mid-Aug. daily 8 a.m.–7 p.m., early May–mid-June and mid-Aug.–Labor Day daily 8 a.m.–6 p.m., Apr. and Sept.–mid-Oct. daily 8 a.m.–5 p.m., mid-Oct.–Mar. daily 8 a.m.–4:30 p.m.).
From the north, the visitors center is on the right just past the junction of U.S. 385 and Highway 87. From the south, the road to the visitors center is a left off of Highway 385 and is clearly marked with park signage.
Here you can find maps, arrange your cave tour, obtain free backcountry camping permits, or purchase National Parks and Federal Recreation Land passes. The Parks and Recreation Land Pass costs $80 and is valid for one year from the date of purchase. The pass allows the holder entry into parks and federal land that charge an entry or standard amenity fee.
Rangers at the visitors center can provide you with information about activities going on at the time of your visit and answer any questions you may have about the park and its environment. They are usually aware of where the bison herd has roamed and will provide updates if seeing the herd is on your agenda. A nice bookstore is on-site and carries a wide selection of local interest books and field guides.
Links:
[1] http://www.moon.com/destinations/mt-rushmore-the-black-hills/the-southern-hills/wind-cave-national-park
[2] http://www.nps.gov/wica