Mackinaw City / Alpena ????

We are planning a trip to the area in August. I am going with a group to dive some of the wrecks in the area. We will spend 5 days in Mackinaw City and 3 days around Presque Isle (Alpena Area).

Any info on sites in the area? I searched and found some 4 year old posts on Mack City. Appears WIlderness is something to our liking. Here are ones we looked up, any recent updates????

Wilderness State Park, Mackinaw City

Mackinaw Mill Creek Camping

Tee Pee campground

Mackinaw City KOA Campground

Haven't found much in the Alpena area.