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I received  9  replies, including the following:

There is a store across from the village green that sells all kinds of 
gluten free products.  If you stand in front of the fire station and 
look across the village green, you will see the store.  I do not 
remember its name.

We live near Rockland, Maine.  My suggestion, since people here are relatively unfamiliar with gluten, is to call the Chamber of Commerce in Bar Harbor, and ask them to send you a restaurant guide or refer you to a website that lists restaurants with their phone numbers.  The best
thing would be to call them in advance and tell them what your situation is.
I am sure they can suggest meals that are plain and simple without all kinds
of additives.  You need to be aware that there are places who buy prepared
meals, so be sure and ask that question and  avoid those places.  Make sure
you bring your own gluten free salad dressings, and mayo (I know Hellman's
is gluten free as is Heinz Ketchup, and Vlasic pickles and pickle relish).
Also, just in case hot dogs might be in order, Hebrew National (because
Kosher prohibits using grains and meats)Beef Franks are very good, and easy
to take in a cooler with milk and juices.  Also, check with Bush's Baked
beans, and make sure they are gluten free, they were at one time ( I make my
own so I don't keep up on that)and the small pop top beans cans are easy to
take, and also French's yellow mustard is gluten free.  Hope that is of some
help.  Hope she enjoys her visit to Maine.  It is a very beautiful state.
And, remind her that our great lobster dipped in butter is gluten free.

I can't remember the name of the place, but there is a small Organic
grocery store off the main street of Bar Harbor.

We visited Bar Harbor. The choices are pretty limited. There are a couple of
major enough food stores, and the restaurants pretty much serve the same
things. It's going to be lobster and potatoes or fish and potatoes. I don't
think there was much of the island that we didn't visit. It is a very
touristy place, but it is also quite small.
The best bet is to visit the Hannaford Supermarket on the island or in
Ellsworth, the town before you get to the island. I didn't visit Alternative
A Community Market. We did go to Tower Market. My advice is that the basics
are at Hannaford Market, but bring gluten-free breads and goodies with you.

There are a few natural food stores outside of Bar Harbor, perhaps on the
way to the island. Go to maps.yahoo.com and look for natural foods. A lot of
choices pop up, but many are specious - Subway, the Bar Harbor Jam Company.

We were in Bar Harbor two years ago. There is a wonderful  health foods store 
that carries a number of gluten free food items, including  bread along side 
the village green and the shuttle stops. One evening, we had  dinner at a 
terrific place called Parkside which is on the main street and  the village green. 
The server was knowledgeable about Celiac disease and I had a  lovely meal. 
Most of the restaurants have simple menus as it is a seaside  community. I also 
had ice cream at one of the specialty shops with no problem.  Jordan's 
Lobster Pond, inside Acadia National Park was quite accommodating as  well. 

There is a place called Skelley's Fries.  They have hand made french fries that are safe.  Skelley's is a small store front restaurant in downtown Bar Harbor on a street that runs parallel to the harbor.

Geddy's downdown is a place to go as is the natural food store
right on the main square where all the shuttle buses go. We stayed at the
Holiday Inn affiliate Bar Harbor Regency Resort which was accommodating.
Even more so was its Lobster Shack on the property right on Frenchman's Bay.
 

 

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