The drive took 8 hours from the Chicago area. Google maps says it takes 5.5 but we were towing our camper. We also had a trailer tire blow out when we were just an hour from the campgrounds.
One of the more popular attractions and the biggest hit with our family was floating down the Platte River. Since we stayed at the Platte River Campgrounds, we were right down the road but it took us a couple days to figure out the right spot, for our family with younger children, to put in.