My wife and I stayed at the Oscoda/Tawas KOA for 7 nights in the first part of Sept 2021 at RV site # 10.  The site was level and adequately spacious.  The campground has a fabulous rec room for kids, although we had none with us, and an outside playground with a jungle gym and other amenities.  There are also cabins that we did not see inside but that appear to be well appointed.  The park staff are friendly and were very helpful at check in time and in giving us information about long term stays.  They also provide accommodation for storing RVs for those who book for the season.