We have been camping NF campground for over 20 years. Love them. Found some good ones and some bad. Our biggest pet peeve is generators. Stayed at Caldwell lake in Michigan's UP south of Munising. really nice CG. Every site has a small beach in the lake. Only problem was everyone, and I mean all the other campers in the park ran generators ALL day and evening. I am sorry but if you absolutely need electricity to camp, go to an RV park. Rant done...
One of our favorites is Lake Michigan Recreation Area near Manistee, MI. Beautiful Lake Michigan beaches, secluded spots, large sites. Boondocking nearby if you want.
Here is a Site I find very Helpful - Campground Directory and National Forest Campgrounds
And I cannot stress enough to explore! When you are in an area of a NF. Go check it out. There is so much that is not published or known. Many of the NF campgrounds and primitive sites can be reserved... Federal recreation, camping and tour reservation information - Recreation.gov
Don't forget about State forests too!