http://www.michigan.gov/dnr/0,4570,7-153-10365_10883-31330--,00.html

Most State parks ban alcohol in some forms. RV areas, private restaurants, clubhouses and special permit areas can in some cases have alcohol. But the drinking and congregating in cars on the side of the road might not be allowed. Some of these rules were put in place because of rowdyism, Kensington Park at Graduation comes to mind in the 60's-70's.