We did a drive through the area last summer, after having just visited Mt. Rushmore on previous trips. We thought we could drive through the Needles and still have time to visit the mountain. We drove, and drove, and drove, and ran out of time. I did not realize how big the overall Black Hills tourist area is.
My thoughts... Get a map. Put a bulls-eye on Keystone. The closer you are, the more likely you will need reservations. The further you get out, the more likely you will find an available campground somewhere. There are plenty of mom & pop campgrounds around - at least that is what it seemed to me as we drove around. Every town has a tourist vibe to it too, so don't think you have to stay in Keystone. DW & I discussed planning a summer trip to the area and staying for a couple weeks - there is plenty to see & do.
From our trip in 2007:
From last summer:
HTH,
-Eric
Eric & Lisa - Oregon
'97 Silverado K2500, New HT383 motor!, Airbags, anti-sway bar
'03 Lance model 1030, generator, solar,