We had plans for a weekend in Rockford, but Rock Cut State Park was booked, and found this on Google maps.
In business since 1966 and the care for it shows. Beautifully groomed grounds under huge oak trees by the Kishwaukee river. It's across the river from a forest preserve so the overall feeling is natural getaway.
When we called to make reservations and said we had a canoe, they helpfully put us in the site nearest the river access  (56), explaining that their map, Google's or Satellite photos don't show the berm and slope down to the water.
Most of the sites are rented seasonally or monthly and you can see that people love returning here. There are two large group sites and two large pavilions.
There are two restrooms with showers that are clean but rather small, probably most people use their own.
The General store is stocked with the usual things, and there's a Rec room with a TV lounge, fireplace, pool table and dartboard. Outdoor activities include a playground, Mini-golf, volleyball court, horse-shoe pits, basketball, shuffleboard and a soccer field. Plenty of open space for other things as well.
Firepits are re-purposed truck rims that seem small for the generous logs they sell.