More than a thousand campgrounds and RV parks in Michigan, most are on some kind of lake. There are more than 60,000 lakes in Michigan, at least 10,000 larger than 100 acres. If a park is not on a lake, it will likely be on a stream.
Where do you want to go in Michigan? Do you want a campground or an RV park (they are not the same thing)?
I think you can find what you want, if you can figure out what you want, using the selection tools at the
Pure Michigan! Campground and RV Park portal.In the U.P. I like the Marquette Travel Park near the shore of Lake Superior, but that won't do you much good if you want to go to Lake Michigan, or sightsee in the Detroit area.
Near Detroit, I like Camp Dearborn, but am unlikely to take a RV there because I have relatives to stay with, and can make day visits to any of the recreation areas in that region.
Near Ohio, consider the state park on Lake Erie near Monroe, or the several state recreation areas (Kensington, Brighton, Island Lake, Waterloo, Pinckney, Proud Lake) on the large chain of glacial lakes between Pontiac and Jackson. That's where I did most of my camping, my first twenty years. These will be campgrounds, not RV parks, but you can find RV parks on lakes outside the the state recreation areas.
Next big cluster of waterfront camping facilities, mostly RV parks, will be around Houghton Lake and Higgins Lake, where I-75 out of Detroit meets US-27 coming up from the center of the state. I have no recommendations there, because if I am going to drive that far north, I will go the rest of the way to the Traverse City area, where I prefer Interlochen State Park, but other people might like the parks on the shores of Grand Traverse Bay, Torch Lake, or around the bay at Charlevoix. Again the pattern, campgrounds in public parks, or privately run RV parks with more extensive amenities but less access to wilderness.
Tom Test
Itasca Spirit 29B