First, terrific park. Lots of trails with a wide variety of landscapes. Prairie, forest, river, it’s got it all.
My campsite was perfect. The woods made it very secluded. It was close enough to water and bathrooms so it wasn’t bad if you planned. They do have firewood available however it is long slab wood, so you do need to cut it yourself. Hand hacksaws are provided, but we’re not great quality which made cutting the wood difficult.
These sites do require a hike from parking. Would strongly discourage big coolers or lots of weight.