Some of the interesting parks or points of interest.
Crater of Diamonds park was a bust - Didn't find any diamonds. It's norm for the past several decades was at least 1 diamond found daily but they turned the ground a month ago and none have been found since.
Hot Springs wasn't at all what I expected (it's a city, but it's called a National Park). Nice area but when you're expecting nature and find yourself in a town, I wasn't sure how to react.
Dogwood Canyon was very nice. Great for a half or full day visit.
Thorncrown chapel was very, very nice. A half-hour visit is enough to enjoy it.
Fantastic Caverns was nice. Go underground on a riding tour for an hour or two. We've been in many, many caverns that have more impressive geology but this one has great history. It was an underground speakeasy during prohibition, bands play down there...
Effigy mounds was interesting but not impressive. I was expecting to see the 100' wide by 500' long by 40' high mounds. These weren't them as they were much smaller. Still a great visit as the wife and I effectively got a 2-hour private tour with a NFS Park Ranger. There were others at the start of the tour but due to terrain, everyone else turned back.
Pikes Peak was good for a short visit. It's a peak overlooking the confluence of the Missouri and Mississippi rivers.