Michigan Recreation Passport is required for vehicle entry into state parks and recreation areas, state boat launches, state forest campgrounds and state trail parking lots. The Michigan Recreation Passport does not cover local, county, municipal, or metropolitan parks or recreation areas. Learn more: https://www.michigan.gov/dnr/buy-and-apply/rec-pp
The best part is that no body know about it! It's rustic, but that's to be expected. Loved it!