This is a trip that my wife and I dream of taking some time as well - the summer after we get a tow such as the RAV4 that gets decent MPG.
Last summer we planed and trained to Montreal where we rented a wiener wagon (small economy car) and tailgate camped the Gaspe, New Brunswick, PEI, Nova Scotia, and Newfoundland. We stayed off of freeways as much as possible. The trip is one of the main reasons we decided on an ultra-light fiberglass trailer. We loved the adventure but found tenting in a backpackers tent a little tiring.
Didn't see much of New Brunswick - where we stopped they where more French than the Quebecois. We ferried across Fundy to Nova Scotia and explored for four days. Tried to find antique and junk shops but where limited by the flight back. Newfoundland is a lot of moose country - Port au Basque is cute and St. John's is beautiful. Plan on staying in St. John's for a couple of days before heading back west. About 60 km out of St. John's there is a B&B that we wanted to get a picture of but my mother-in-law was along making it a bit awkward - its called "Dildo B&B"
Please snap a picture and post.
PEI is amazingly tiny - worth taking bicycles. Anne of Green Gables is a big tourist trap: be prepared to be dissappointed. The cool thing about PEI is that they make you pay to leave the province. Its free to enter the province but $$$ to leave ($42 rings a bell for the little car).
Back in New Brunswick we found that they speak English in the northern part of the province. Visit the Bay of Fundy - its pretty cool.
We arrived in Quebec City for some kind of festival but found it a bit limiting as even the bus drivers don't (refuse to) talk English. We actually found the Beijing, China subway system easier and more English friendly than Quebec City.
Montreal is a much more cosmopolitan city: people seemed to try a lot harder to speak other languages besides Trudeau's favorite. I'd go back to Montreal in a heartbeat.
We did Montreal to St. John's and back in about 10 days and put on 8400 km on the rental car.
Campgrounds ran about $25 per night.
The drive from BC depends on your own endurance. The Manitoba/Ontario border is halfway to Toronto. Toronto to Montreal is all freeway.
Keep the forum posted on plans and the actual trip.