Really loved Bar Harbor. Tender transfer was fine. Weather was amazing and I had my Lobster Roll, which was worth every dollar. Only observation is that it is geared towards the Cruise ships and very commercial but we found some lovely places once we came off the main street.
Simple for this, not enough time. You have to be back on the ship by 3.30pm which gives you hardly enough time to touch the surface of Boston. For the English reading this, Quincy Market is Covent Garden, London.