Suggestions on a route without Interstate. Leaving in May...time is not a concern. I was looking at US 50, but open for suggestions from those that have made the trip.
Google maps suggests going through Canada from Sault Ste Marie (when told to avoid highways). That is a general plan worth consideration; the Trans-Canada highway (17) is a pleasant, fairly easy drive, if memory serves me and I'm not confusing it with another.