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.
Finished the circumnavigation in early February in Grenada. Have to work on a book project for the next several months so the boat will be waiting for next year.