The airport in Halifax is not near anything, including Halifax. We bought a boat that was in the Chester area and found that it was pretty convenient to take a bus from just outside the marina gate to the Halifax bus station and then another bus to the airport. If you find a suitable marina contact them and ask how one gets to the airport from their location.
Back to Grenada in early December. Not sure I will remember how to sail. Will spend the winter and early spring in the Caribbean and then head to Bermuda and the northeast US. Still trying to decide if we will bring the boat to Canada, either in 2015 or 2016.