Is the Island Explorer shuttle accessible from the Acadia Inn?

Yes. It stops right in front of the Acadia Inn from the end of June until the middle of October and takes you to downtown Bar Harbor. If your destination is downtown, brilliant, you’re there. If you wish to go further afield there are other buses available downtown that can take you all over Mount Desert Island and into Acadia National Park. Here is the link to the bus routes and schedule: Island Explore Website