We are taking friends from England on an RV tour next June. We drive from Denver to Legion Lake Campground (Custer State Park, SD). Spend 3 nights there seeing Mt. Rushmore, Crazy Horse, Jewel Cave, and generally looking around the Black Hills. Currently our route has us leaving CSP and driving to Rapid City then going west on I-90 to Sundance then north to Devils Tower. Then to Cody for the night rodeo and on to Yellowstone.
Would it be faster/more scenic to go through Hill City and then up Hwy 385 to Lead and Deadwood to I-90 when we leave instead of through Rapid City?