Over to Escumins, up to Forestville, stay the night. Next day up to Bai Comeau for lunch, go over the longest suspension bridge in the world, back down to Sacre Coeur for the night. Last day back to the HS, short way via 93, long way over the Ferry and back under the Saguenay.
or
Up to Chibougamu for the night, then down to Senniterre and then stay at Lac Fillion, they back to the HS. Big trip, big miles, you can do in reverse too.