Personal Recollection: Everybody in the Northwest suburbs of Detroit knew about Camp Dearborn. In theory, only Dearborn residents were allowed but there were ways around it. My family has camped there in some of the cabins. They had all the amenities like showers and such in community buildings. They would put on dances at night and of course they had the paddle boats and swimming. It was a great place for a company or church picnic.
From Wikipedia
Camp Dearborn is a park in Milford Township, Michigan owned by the city of Dearborn, Michigan. The 626 acres (2.53 km2) park has several ponds and lakes as well as access to the Huron River, a half-mile swimming beach, swimming pool, picnic sites, and camping areas. Activities include fishing, paddle boat rentals, hayrides, dances, miniature golf and a 27-hole golf course. Canoe/kayaks can launch into the Huron River while a bike trail connects to downtown and other local parks. Camping is available for tents and RVs on 191 sites (including a section for permanent trailers) and in 118 permanent tents and 30 cabins.
Camp Dearborn opened on May 29, 1948 under leadership of Mayor Orville L. Hubbard. Services in the park are provided by Dearborn city employees. During the Great Recession of 2008, Dearborn investigated selling off the camp but found that the camp was profitable and that there was no prospect of a reasonably profitable sale due to zoning issues.