Hope you have a great trip! Will be following your circle route with interest - it's on my list for this year. I just rode #2 & 28 from Duluth to the Sault last week - some nice lake views but there are more if you stay closer to the big lake. +1 on Pictured Rocks. On the North Shore, Neys and Pukaskwa Parks are good spots.
7 - 8 days sounds like lots of time for looking around on the trip.