This past fall in the off season (october) we went from NY to gaspe' and around the coast in New brunwick and PEI and home.
Our favorite part was Miscou Island. We were in time for the fall colors of the wild berries and we overnighted for two nights at the lighthouse as it was closed. Pretty sure that wouldn't fly when you are going. Bought some veggies from an Acadian man (fun trying to converse with him) selling by the roadside.
Forillon Naitonal Park was great...nice hiking but even in October there were busloads of hiking groups...
PEI was pretty and we were glad that we were not there in the ON season. We did a lot of the coast but in the end cut that short because we got it already. Our favorite was the Wind Energy Institute of Canada up in North Cape. It gave us a place to walk and a place to overnight (thanks!)...fell asleep to the whirring of the windmills. WE stopped at a few closed provincial parks to have a walk around as well.
It was a driving vacation with not a heck of a lot offered as far as hiking trails beyond forillon National park..other parksclosed for season...which we knew. No beaches to walk. Pretty yes but not our favorite...just something we wanted to do.
The town that Perce' rock was in was well touristed and it showed. Scenic.
We stayed in a lot of picnic parks along the way and a couple of walmarts in the north part of peninsula.