Will you be piloting into this fair state; or commercial and then renting a car? From Bar Harbor area you could "pilot" into KRKD(Knox County Regional Airport - Rockland) and take in Farnsworth Museum(world class art museum best known for its Wyeth family collections). On the other side of KRKD is Owls Head Transportation Museum. If you were to "pilot" into KBXM(former NAS Brunswick), or by highway, there's the Maritime Museum in Bath, ME; and the famed Peary-MacMillan Arctic Museum at Bowdoin College, Brunswick. Is it possible(?) to miss LL Bean(Freeport)?
If in the KIWI/KBXM(Wiscasset/Brunswick) locales(either one a 15 minute drive --opposite directions -- for me), you're more than welcome to use my guest room. I only need an hour's notice. Also in Brunswick Bowdoin College's Art Museum is of wide acclaim. I've only mentioned locales en route Bar Harbor to Boston. There's also Camden, Boothbay Harbor, Five Islands(Georgetown), where I live. Y'all need more time, and Dr. Bruce wouldn't let you get out of the Bar Harbor area without numerous of "his" favorites.
Photos: Camden, Boothbay Harbor, Boothbay Harbor, Bath. The Bath image is a "copy" of my 24" x 36" photo canvas print, will show a texture not in the other images.
HR