Sinkhole Pathway Mackinaw State Forest, M-33 & Tomahawk Lake Hwy, Onaway, MI 49765 Add To Trip WebsitePhone: (989) 785-4251 Description 2.5 mile hike, bike trail. Trailhead 13 miles SE of Onaway via M-33 & Tomahawk Lake Hwy. Nearby Shoepac Lake and Tomahawk Lake State Forest Campgrounds. Recreation Passport required for entry. Videos Map Nid Is less thanIs less than or equal toIs equal toIs not equal toIs greater than or equal toIs greater thanIs betweenIs not betweenRegular expression And Show NearbyArts & CultureAttractionsEat & DrinkLocal InfoLodgingRecreationShoppingTransportation Apply Photos TripAdvisor® Traveler Reviews More To Explore Categories: Biking Hiking Recreation City: Onaway Region: Northeast Although the MEDC uses reasonable efforts to maintain the accuracy of the website content, it is not represented to be error free. Read legal information.