I've been there a couple times over the years. One of those times was with my Vmax. Not a bad thing to experience every great once-in-a-while, if you ask me. Not the sort of place to visit if you don't like MAJOR TRAFFIC and/or too many motorcycles to count.
My favorite ride was through Custer State Park and the Needles Hwy.
My favorite moment was during an evening spin through Spearfish Canyon when one guy, on his Triumph Rocket III was "taking on all comers" going up one very long hill with a passing lane. Third time I watched him pull into the passing lane and challenge faster paced HD's or other, I couldn't stand it any longer - I pulled ahead of my group and anticipated him doing the same to me. He did. I did. He learned a new respect for an old Vmax. The wife, watching all this from just behind, said it looked as if he didn't quite know what had happened.
We've stayed at the Creekside Campground, right across the hwy from the dragstrip, both times we went. They accept tents or RV's and anything in between. They also offer camping cabins, if you book early. And they sell misc stuff like ice, pop, toiletries etc in addition to cooking breakfast & lunch for anyone interested.
Unfortunately, we aren't makin' it there this year.