Just returned from a trip to Niobrara State Park. We stayed in cabin #8 which has a wonderful view off to the east. This park has views for miles, amazing sunrises and sunsets and plenty to do for adults and kids, alike.
Two critical flaws kept me from giving a five-star rating. 1. The cabins do not have fire pits. They do have outdoor grills, but these are no substitute for a "real" fire pit. 2. Whoever determined the placement of the two cross pieces in the windows of the screened porch (first photo) didn't take into account the average height of a seated adult. The top cross piece blocked the river from view. I'm pretty sure I understand the purpose of the cross pieces (to keep people from sitting in the window sills and leaning against the screens), but the same thing could have been accomplished without blocking the view.
Beyond that, a lovely, scenic park with neat and tidy cabins, tent & RV camping and even a swimming pool.
One final note, if you plan to hike down to the old railroad bridge, you'll need to change your plans. The bridge appears to have been washed away and "death and injury" signs are posted at the trailhead.