I live in Mi
Just spent a week at the cottage my grandparents owned when I was a kid, and visited every summer (now it belongs to my cousin). It’s on the southeast end of Beaver Island, one of the darkest spots in the eastern part of the USA. I always knew it was dark and enjoyed looking at the stars there, but last week was the first time I took a telescope and wow the Milky Way was out and it was incredible. I just loved the way it stretched across Lake Michigan. Jupiter was so bright it cast a reflective glow on the water like the moon does. One night the seeing was so good I split the b and c stars in Alkalurops (1.5 arc seconds!) with my 81mm refractor.
This spot was already one of my favorite places in the world because of the wonderful times I’ve spent there growing up, but now it’s also a favorite place to see the stars too.
SQM readings of 21.7 one night, 21.4 another night.
I live in Michigan and Beaver Island is great!
I have a few favorite sites of my own. The first is my mother's house south of US-23 between Omer and Au Gres. It is Bortle 2-3 on a good night with good transparency. The biggest issue there is that it is only a mile or two from Lake Huron and the property is very marshy. This results in many nights with high humidity and associated low transparency (and lots of bugs). It also often requires very active dew control measures, even for visual. That said, on a good night M33 is easy with the unaided eye.
The second semi-private site I have access to is my father-in-law's cabin on the North Branch of the Au Sable river off of McMaster's Bridge Road north of M-72. While densely wooded, there are a few clearings where the zenith is visible. This site is probably Bortle 1-2 and is one of the few places east of the Mississippi where I have seen the summer Milky Way cast a shadow. It is truly magnificent.
There are also a number of pretty good public sites in the Lower Peninsula (and easier to get to than Beaver Island):
1. Port Crescent State Park: This site is in the Thumb north of Caseville on the Saginaw Bay. The Michigan DNR actively promotes the site for astronomy use. I've never taken a scope there, but went for several meteor showers and to look for the aurora north over Lake Huron.
2. Huron National Forest Lumberman's Monument: This site is a bit difficult to get to, but is in the middle of nowhere. There is a ton of public land around, so sometimes there is a lot of traffic, campfires, etc. that can cause issues.
3. Headlands International Dark Sky Park: Wonderful location. Skies are probably Bortle 3, but the amenities and ease of getting there make up for it. Often this park is overrun with visitors, especially if there is some noteworthy celestial event, which can make it a challenge.
4. Almost any state campground or park north of US-10. Find a dark state campground or parking lot without lights near a major road. I am partial to the ORV Trailhead parking lot off of M-61 between Standish and Gladwin.
Of course, my most used site is none of these. 90% or more of my observing is done from my Bortle 7 back yard. These days I am really focusing on the moon, open clusters and double stars, so light pollution isn't really an issue.