Best whale watching boat I ever went on was actually a fishing boat out of Gloucester, heading to the fishing ground the captain spotted a whale breaching off in the distance, he asked us if we wanted to continue to the grounds or take a detour and look at the whale. We all voted whale. When we caught up to it, the whale would breach near us and swim around and under the boat, I remember a lot of dolphins swimming all around the whale. We lost an hour fishing, but we all thought it was worth the side trip.