When in Bar Harbor make sure you stop by the Thirsty Whale
great sea food and locally owned. If you are into local beer, wine and good BBQ stop by the Atlantic Brewing Co.
There are some great public gardens on the island to visit as well:Thuya Garden
, Asticou Azalea Garden
, Abby Aldrich Rockefeller Garden
, Wild Gardens of Acadia located in the Acadia National Park.
If you need some quite time away for the summer people visit the western part of the island Somesville, Southwest Harbor, Bass Harbor Head Lighthouse.
One of our favorite boat tours is out of Northeast Harbor VIP Somes Sound Fjord & Harbors Tour
Hope this helps.
Before we moved we lived not to far from MDI great place to hang out.
Enjoy your time on MDI...you'll love it