I read about this in Michigan History magazine:

http://www.mackinacparks.com/native-...history-trail/

The nearly eight miles of motorless highway circumnavigating Mackinac Island is set to get an update this spring. The Native American Cultural Trail will feature six individual panels discussing the history and impact of Native Americans on the Great Lakes.
“Native American history and culture is not something we actively interpret a great deal on Mackinac Island, currently,” said Director Phil Porter. “We hope these new informational panels will educate the public and provide perspective about the pre-contact history, trade, culture and more.”
The panels were drafted by Director of Archives and Records for the Little Traverse Bay Band of Odawa Indians Eric Hemenway with help from Mackinac State Historic Parks staff and will be installed by Mackinac Island State Park operations staff.