I’ve made the turn at Duluth and cruising along the (virtual) Minnesota shoreline on my way to Canada. At 565 miles, I’m getting close to the halfway point around the lake.
Even from virtual experience, it looks like the northwest side of Lake Superior is likely to provide the most enjoyable leg of the journey. Almost the entire segment from Duluth up to Thunder Bay closely follows the shoreline which, at least for me, always makes for better cycling.