Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Rapid City (37% of total searches to South Dakota). The next most popular destinations are Sioux Falls (35%) and Deadwood (20%). Searches for hotels in Keystone (8%) are also popular.
KAYAK users have found double rooms in South Dakota for as cheap as $41 (Lead) in the last 3 days. The average price is $169.