Map 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 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.