South Sandusky is a very nice Corps of Engineers Park on Rend Lake off of I-57 in Illinois. We had one of the few full hookup sites with a paved pad and picnic table. It was a short walk to the lake from our site. We did not use the bath houses or do any shopping in the area so we can't comment on that. We spent 2 nights and enjoyed our stay.
You can find more information about Corps of Engineers Parks here
Would we stay here again? YES