Wow, Chief, you really do have some good info at times. Pat's in Orono still is exactly like it was when I first frequented in '73. I summer mid-coast (Stockton Springs) and go there at least a couple of times a month.
Superjohn, if you go to the properly recommended Acadia, you can also stop at the Pat's in Ellsworth for pizza and a good beer selection (Geahgan's Smiling Irish Bastard is very good, as is Baxter Stowaway IPA). There are lots of restaurants in Bar Harbor but are mostly tourist oriented.
You mentioned wanting to visit the Wyeth Museum in Rockland. It so happens that the first Friday of each month (so, this Friday the 4th) in Rockland is an evening Artwalk about town with all the galleries open, along with free admission to the Farnsworth (Wyeth) Museum. I'm planning on going. It's my birthday and my wife wants to take me to Cafe Miranda, also recommended. The Flatbread Company between Rockland and Rockport is good.
Camden is a beautiful town to visit. There used to be the landmark Cappy's, but it is now a Sea Dog Brewpub. We like Long Grain, and there are others, like Camden Deli.
Other favorites are The Great Lost Bear in Portland, Sea Dog in Topsham for the atmosphere, Beth's Farm in Warren, Young's in Belfast for lobster.
Though the GPS will try to take you via I-95, the Coastal Route (Route 1) through Brunswick, Bath, Rockland, etc. is the way to travel to that area.