As you drive up into the hills, you could hit Reptile Gardens and Bear Country - easily can both be done in one morning and they are not far from each other on the way from Rapid City to Rushmore. Go to Wind Cave also. We basically did most of what you have on your list and I would say Crazy Horse was the biggest waste of time.We're taking a driving trip from DSM area to the black hills/Rapid City area at the end of the month. Wife (no pics), 10 and 8 yr old. So far, this is the list of things we came up with...looking for other recommendations of must do's vs. avoids. Staying 5 days in Rapid City.
Mount rushmore Bad lands Crazy Horse Wall drug Devils tower Custer state park white prairie dog town Evans plunge mineral springs Deadwood Wooden bigfoot (keystone) Fort Hays Chuckwagon Supper Club Rush Mountain Adventure Park