Hi El and Bill,
I'm not a very active member but noticed your message and perhaps I can help. I've lived in Terrace Bay for 18 years and have logged some hours exploring alot of the area around here.
There's so much to tell you, but let me begin by saying that the summer is short and I would suggest you aim for the middle of it! Late June, July or early August is best. The shoulder seasons tend to be windy and cool.
Highpoints.... Slate Islands ( caribou, lighthouse, shattercone, rugged wilderness), Village of Rossport ( good food, fuel, clusters of near shore islands), Rossport to Marathon ( spectacular scenery, rugged coastline, cobble beaches, sand beaches, ghost towns, lake trout etc).
Spend some time researching on the web... if this trip looks promising, feel free to contact me with any questions.