We live in SW Michigan, and would be most interested in learning about nearby (100 miles from Kalamazoo) sites.
To get things started, I can say that we have often stayed here at Fort Custer State Recreation Area, near Battle Creek. We have come here in a truck camper, small fifth-wheel, and now in a 19' hybrid trailer. We always bring our bikes, as there are lots of paved and cross-country trails to explore. Many families with small children, and lately, lots of (barking) dogs.
I had to complain at the office last night, for the first time in 10 years of camping here, due to loud music from a nearby campsite. Staff made several visits to the offenders, who finally turned down the volume.
Campsites are separated by lots of vegetation, including mature trees, so privacy is very good.
Overall, for seniors, I would rate this as a B+. A better rating would require an on-site store (though ice and firewood are available) and water hook ups. (all sites are electric only-30 amp). This is a good value, at $21/night and a Michigan Passport is needed.