Has anyone been on New England Cruise?What are the best "ports of call"? Do you suggest any particular cruise line? Is there any chances of whale sighting during the cruise journey or we have to book particularly in this regard?

Just wanted to give this topic a boost because I'm interested in taking a New England cruise myself someday. I've heard that the best time to do it is in the early fall, when all the leaves are changing colors but before it gets miserably cold. I think all the major cruise lines offer New England cruises, but does anyone have a personal preference? I'm kind of inclined towards Princess because I've had so many great trips with them, but I also think it would be fun to give someone else a try. Maybe Carnival...