Indeed. Usually if an area has a bunch of popular localities, the locals sell guide books and sometimes do tours. The university+museum and/or the local tourism hub in Houghton, MI have such material.
The rest of MI is rather boring, unfortunately. There are petosky stones near the tip and various other minerals, but outside of gravel mines you’ll be mostly out of luck.
No, but that’s a good idea. I’ll do a writeup.