Otsego Lake is a great campground. It's quiet for a state park, and the sites are roomy. The sites on the outer perimeter have large trees and some have water views. The lake is clean, and in addition to the main beach there is a dog beach and multiple access points away from the crowds. The bathrooms were older but clean and well-maintained.
There is some easy hiking on the other side of the lake, at Pine Baron trails. We also enjoyed going to nearby Gaylord for mini golf, restaurants, and an elk park.
We stayed in the Lower Falls modern campground for 3 nights. The Lower falls were a short hike away, and there was a nice hike to the Upper falls 4 miles away. Unfortunately our campsite backed up to one that was full of noisy, ill-behaved children and a very loud dog. The bathrooms and showers were not cleaned very often and were covered in mud. If I went to Tahquamenon again I'd probably choose the Rivermouth campground in the hopes that it would be more peaceful.
Silver Lake is a popular destination for off road vehicles, so this campground is always full of vehicles and traffic. For most people at the campground this isn't an issue because they also have ORVs there. This campground is quiet compared to the others in the area, and they enforce the 11pm noise curfew. The sites have fire pits, tables, electric hookups, and water. Wifi is available but restricted to 1 device per site. There is also a pool and laundry facilities and the bathrooms and showers are always clean. There is a private beach for campers across the street, which is also clean and offers beautiful sunset views of the sand dunes across Silver Lake.
We tried to stay at the campground, but it doesn't take reservations and all the sites were full by Thursday afternoon in February. We did explore the hiking trails, which were nice sandy paths with pretty easy terrain. The river is very pretty and fast moving. It was too cold for swimming in the winter, but the beach was clean and would be great during the warmer months. The bathrooms were also clean and there were some nice picnic pavilions, which included wheelchair accessible tables. This would be a great place for a family trip, but definitely have a backup camping plan during the busy season!
Lago Linda's is located in the Red River Gorge area, which makes it a great location for rock climbers to camp at. It's about a 15 minute drive to Muir Valley. The campground has flush toilets and showers, although they aren't maintained the best. When we stayed there was one toilet in both the men's and women's restroom that was out of order. There is a nice cooking pavilion, drinking water on every site, and electric at the sites and pavilion. There's also an indoor game room/reading area with a small library and board games. The pond is pretty clean and nice for a quick swim after a day of climbing.
Ludington offers both modern campsites and backcountry hike-in sites. We opt for the hike-in sites because they're very spacious and private, with easy access to Lake Michigan. There are 10 backcountry sites, which share two pit toilets and a water pump. Each site has a fire pit and a picnic table, and the park offers firewood delivery daily so you don't have to hike with it. If you need showers or flush toilets they are a 1 mile hike away in the main campground. The hike to the sites is very easy as it's also the sand path to the Big Sable Lighthouse. Crossing the path and going over a small sand dune will land you right on the beach. These sites are very popular because they're so great, so I would highly recommend reserving 6 months in advance for any summer weekends.