I've done 7 day trips several times statting in Petoskey riding to the bridge, doing the van /trailer ride to St.Ignace then to Drummond for a ferry boat ride to the island then ice bridge to St. JOSEPH Island then north all the way to Hearst and back. Make sure you get a Teddy burger in Hawk Junction.
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Soo to Hillsport, Ontario and back via Hornpayne, Manatowadge and Marathon