Good basecamp, especially for ORV users
At 217 acres, Muskallonge Lake State Park is on the smaller side. However, it is a great basecamp to visit the many scenic locales throughout the northeastern section of the Upper Peninsula.
The campsites vary immensely in size throughout but include both paved, gravel, and grass sites in essentially all the loops. This much variety allows you to choose if you want a woodsier feel (sites 131-159), a more open area (sites 1-80), or a little in between (81-130.) Two bathhouses are available since the campground is so large.
If you have an ORV/ATV, Muskallonge Lake State Park is one of the few state parks where you can ride your ORV straight from the state park to the many nearby designated ORV trails. (This is special because in most Michigan state parks you have to keep your ATV trailered and haul it to the trailhead.)
The Lake Superior shoreline is a great place to hunt for all types of rocks from agates, granite, basalt, and even Petoskey Stones. At the campground host station is a board that describes the different rock types and what they look like. Before you head to the beach check the host station first to see what to look for. (Note, if you take a UV flashlight with you once it gets dark you might even find some of the special Yooperlite rocks!)
The only hiking trail in the park is a 1.5-mile trail that connects to a segment of the North Country Trail.
A designated swimming beach is available near the campground, as well as a small day-use area with a few picnic tables, grills, and some old playground equipment.