I would hug the NE/SD state line for a scenic drive and look around or even stay in Yankton. There is a latge state park that has hiking to the far western edge. Newton Hills by Canton is a pretty neat place, largest section of timber on this side of the state, at least it appears to be from Google maps. Falls Park in Sioux Falls is kinda cool, but not much else to do for hiking/history. Palisades state park, by Garretson, as previously mentioned, is a neat spot. A mile or so away in Garretson is Devils Gulch. Supposedly there’s no bottom to it and Jesse James is to have made an impossible jump over it to get away from a posse.
Assuming youre doing the Fur Trader Museum in Chadron? The state park south of Chadron is great.
Yep, doing the museum. We are swinging that way coming home from a family reunion in Pueblo, CO. We are stopping in Cody and Pinedale on the way out.
I'll look into Yankton.