Was at Deadwood last year, before bike week. Crowds are not my thing. MEH. The casinos are small and crappy. Its a tourist trap. Same for Sturgis. The motorcycle museum is small and expensive.
Best part of my trip: Badlands nat'l Park, Mount Rushmore, Custer State Park, interesting roads for a Bike, wild burros and buffalo, There's a cave in the area, and although we didn't get there, Devils Tower is not far away. Wall drug is another tourist trap.
That's my 2 cents.
Gary