The only tender port on Boston to Montreal itinerary (barring unusual circumstance) is Bar Harbor. We do this cruise back-to-back every summer and it's one of the best HAL short cruises IMO
We never tire of it and have written reams about it and Maasdam. I think you've seen some of it 'over there'.
You don't mention 'seeing' Montreal. Hope you have planned time to see something of this fabulous city.