Explore northern Michigan trails in Michigan's Great Outdoors, bringing you over 1,600 miles of hiking and biking trails, over 700 miles of rivers and 100 miles of Lake Michigan shoreline.Travel through 385 miles of groomed snowmobile trails, 3,000 acres of sand dunes, 950,000 acres of National Forests and 71,000 acres of Sleeping Bear Dunes National Lakeshore.