Devil's Tower for sure. First watch Close Encounters of the Third Kind though.
Don't forget the Jewel Cave. It's so deep you go down in an elevator. We've been in that one and the Wind Cave. They are both good, but I prefer the Jewel Cave.
Ride the shuttle buses in Deadwood. It's the best way to see the town because parking ain't no fun in Deadwood. :? And make sure you're downtown in the evening for the big gunfight and then go to the trial. Beware that they pull audience members out for jury duty though. :wink:
Check out the Bullock hotel. It's supposed to be haunted. :twisted:
And no one goes home without an old fashioned picture from Keystone. They dress you up and make you look like you had it taken in 1890.
Have fun and report back. We want to hear what you did.