When we go for our annual trip in Sept/Oct Bar Harbor village is always crowded, especially when a big cruise ship dumps 3000 passengers in town. The rest of the Island is uncrowded, even the NP, as is the "quiet side". The exceptions are any places the tour busses drop people off, such as the Jordan Pond House and to some extent the top of Cadillac Mountain. We've had to hunt for a parking space at Jordan Pond (in our Class B) but have never had a problem on the mountain. I wouldn't hesitate to head "Down Maine" in May!