South Dakota hills

I wake up early...6:30 and it's pretty foggy on the river, below the spillway, but the fishermen are already out there, but by 7:30 , you can't see across the river, so no biking right now, but the coffee is good! I decide to go into town and get an oil change before we break camp. OK, that's done & we folded up the popup and go back over the dam & hit the trails again..lovely campsites everywhere! I proceed with more riding & KK goes off to shop and meets me at wally. Off we go to I-90 and westerly to our next KOA and a side trip to see MT Rushmore. I-90 is flat and then all of a sudden it starts rolling and the landscape looks like a seen from "Dances with Wolves". Now we're camped in Belvidere, SD and we have the only tree in the park(well, almost). Off to see the "big faces" tomorrow...40 miles and some climbing today..kk 12 miles.