Hoffmaster State Park is a great campground. Drawbacks for me, there are only 4 sites that are semi modern to choose from. So get in early or you'll get stuck with modern. There are a ton of trails which is great. But the longer the trail the less signs you will see, so take a map and plenty of water as you might be out longer than expected. I'd recommend this camp ground early in the season if you want privacy, otherwise it'll be packed and far less enjoyable! I prefer rustic sites so camping on top of other people doesn't appeal to me.
Warren Dunes State Park is great, I went here for the sole purpose of the dog beach. Miles and miles of it! It's a beautiful park with lots of trails, lots of dunes and beach on Lake Michigan. I think it's a hidden gem for Michiganders. I prefer rustic sites and Warren Dunes has rustic sites and a modern campground. My site had a trail head leading out off the back, it was perfect. Warren Dunes has tons of trails, dunes and beaches. The best part, dog friendly off leash beach! If you travel with dogs, it's a great campground! There are water pumps and outhouse restrooms on the rustic sites. There is also a general store on the grounds should you need anything you forgot. Also, there is no alcohol allowed on the grounds.
Wilderness State Park is one of my favorite campgrounds in northern Michigan. They have true rustic sites, where you have to hike into, usually a little over a mile. If you want to get away into your own space, Wilderness has it. There are plenty of trails to explore and of course some Great Lakes State waters! They also have regular campsites and cabins. I haven't stayed in those areas, but have checked them out and they look great. My focus is always on the rustic!! Also, Wilderness opened a dark sky park this past year as well. If you want to explore some gorgeous dark night skies in Northern Michigan, I suggest checking it out!