We stayed at Elkhart RV park, it is an old KOA park. It was clean, they have full hook ups as well as not. We had a shady area. The laundry and bathroom showers were clean. The pool was clean too. I think they had a playground for the kids and a couple of other outdoor things. It was near the turnpike but was quiet.
When driving thru Elkhart, look around for fiberglass Elks that are painted in different colors, etc. If traveling with kids, they will like looking for things.
It was a good central location to go to the RV museum, South Bend, Goshen, and the other small towns around there. There was a Amish museum/resturant, etc. where you can get good cheese, etc.
Hope the weather is cooperative when you are there. We were there the last week of June and about the time we were ready to go explore museums, etc. around 10 am, we had a thunderstorm that didn't want to stop.