Lewis & Clark National Historic Trail - Between May 1804 and September 1806, 32 men, one woman, and a baby traveled from the plains of the Midwest to the shores of the Pacific Ocean. They called themselves the Corps of Discovery.
Wind Cave National Park A park is named for its sacred cave who's air which is either sucked in or blown out depending on atmospheric conditions.
Include National Wildlife Refuges in this section as well, Lacreek, Sand Lake, Waubay, Lake Andes National Wildlife Refuges.
South Dakota is served by two major airports, Sioux Falls Regional Airport (FSD), in the southeast, and Rapid City Regional Airport (RAP), in the west. Sioux Falls Regional Airport is served by airlines Northwest, United, Delta and Allegiant. Rapid City Regional is served by airlines Northwest, United, Delta and Allegiant. Aberdeen, Watertown and Pierre also have scheduled commercial air service.
Two major interstates cross the state, Interstate 90, which runs from Seattle Washington to Boston Massachusetts, and Interstate 29, which runs from Kansas City Missouri north to Winnepeg Manitoba, Canada. Additionally, federal highways running east-west include 12, 212, 14, and 18; north-south highways 85, 385, 83, 183, 281 and 81 also traverse the state.
South Dakota is not served by Amtrak passenger rail.
Because South Dakota is rather sparsely populated and little mass transit is available, most residents and visitors use the state's roads and highways to travel from place to place. However, traffic is light and roads are straight and direct, so it's easy to get wherever you want to go.
Corn Palace in Mitchell
Al's Oasis in Oacoma on I-90 near the Missouri River.
The eastern part of South Dakota is in Tornado Alley so might want to check the Tornado safety page if you are visiting South Dakota.
To the north and south are the fellow plains states of North Dakota and Nebraska, with various attractions in each one, but for a different type of state, consider going either east to forested Minnesota, or west to eventual mountains in Wyoming or Montana