We travel Northern Minnesota, UP, and Door County most every summer. Have to get out of the great humidity in SW MO.
We like our FHU sites, so most state, county, city parks are out. In looking at different places to its important to us to have reservations. I really like to know I have a place to put my head. Where you are wanting to go is very popular and sites get full very quickly.
In Door County WI we like Hy-Land Court https://www.hylandcourt.com/
They are in a good location to enjoy most of Door County
In the UP there are many things to see and do after doing the mackinac island stuff we found a great little park in Curtis called Log Cabin Resort https://www.uplogcabin.com/ Curtis being almost in the middle of the UP made seeing things very easy.
I hope this helps somewhat
Itasca Meridian SE 36g
Road Master Tow Dolly