Pictured Rocks, Michigan Upper Peninsula

[Goodaches]

With the Bicycle overlay on GoogleMaps a trail appears along Pictured Rocks region between Grand Marais and Munising.  I thought the park service website indicated that the trail is hiker only. Is it another GoogleMaps error or is there a dirt bike path along the shore between those towns?
 I'm thinking about a self supported ride from Newberry, to Whitefish Point, to Grand Marais, to Munising, and back to Newberry in summer of 2017. We'll be on mountain bikes and off pavement routes are preferred.