Need help finding boon docking sites

[smarks1632]

Hi everyone
We are new to rving - full timing - and we hope to do mostly boon docking. We have been trying to plan our first trip and can't seem to locate boon docking sites. We have the Days End Directory but it is so limited in the area we want to visit.
Our first stop will be in SD, hopefully near Custer. From there we want to stay in MN and then onto any area around Lake Michigan/upper peninsula.
Any tips on what method to use to find boon docking sites?
We appreciate any help!
Thanks
Kat and Sandy Marks

[sinder]

Here is a map of MN boondocking and low cost camp sites: Minnesota

[atom ant]

Most of the Custer State Park is primitive sites if I remember. Some may have electric.