We stayed in Bar Harbor about four years ago and found this GREAT place for drinks, but can't remember the name?
It was about a fifteen minute ride from the center of BH on a very rural road. The place sat on the harbor and I believe there was an inn atop the hill that served food.
However, the most remarkable part was a small shack that was at the end of a pier. In the shack was an awesome bar, just big enough for a few tables and stools. Outside the bar was a deck to sit by the water.