We are driving from bar harbor Maine - 2 days there
Then 2 days at bay of fundy on New Brunswick side
Driving to Halifax for 3 nights 2 days
Could stay another day before driving back to Maine
Planning to travel last week of September
you could take the ferry from Saint John to Digby then cut across to Lunenberg area to make your way to Halifax. Cape Breton really needs at least 2 nights to make it worth while. You could do Hopewell Rock on your way back. An extra day could be going to PEI via Caribou NS to Wood Island ferry then across to take the Confederation Bridge to get to Hopewell Rock.
ps google maps does not work for the ferry to PEI in the winter months as they use live data.Edited: 11 March 2016, 12:52
Taking your extra day, I'd suggest driving through the Annapolis Valley, perhaps stopping at the Grand Pre/Wolfville area for lunch. Great time of year to visit with all the fresh harvest & vineyards.
Then continue on to Annapolis Royal for the night. It's only aprox 15 min drive from there to the Digby ferry.
Bar Harbour is a lovely place; I had the opportunity to spend a couple of summers there some years back.Edited: 11 March 2016, 23:24