We're camped at Tahquamenon Falls State Park - Lower Falls - Hemlock. The sites are level and fairly large (site 187). If you have an RV and your neighbor has one too, the sites are fairly private but otherwise there's not much separating you from the next site. We are parked on dirt, not much grass on our site but there's the standard picnic table and fire ring and the site seems well groomed or the last folks did a good pick up before they left. No trash or cigarette butts.
The bugs aren't horrible but you have to make sure you get some deet/ThermaCELL/picaridin or shelter at dusk or risk exsanguination.
Pretty happy with the site.