One rainy day we visited the Owl's Head Transportation Museum, 2 miles south of Rockland. It is open year around and is home to a collection of antique aircraft, automobiles, motorcycles, carriages, bicylces and engines. It houses a full sized replica of the Wright Bothers's Kitty Hawk Flyer, which is shown here.
Another rainy day we went to the Farnsworth Museum in Rockland which is widely recognized as America's only museum dedicated to telling the story of Maine's role in the history of American art.
The Lighthouse Museum in Rockland houses many artifacts from lighthouse days of yore. They weren't supposed to be open until May 31 but I called and the fellow who answered the phone said you might as well come to see him since he was there anyway and he took us on a personal tour for about 2 hours. Delightful people in Maine. Photo shows some of their collection.
The Maine Prison Store in Thomaston is a must see place.
Just north of the Samset is the town of Camden, which is a delightful place to visit. Good shopping and lots of it. A great harbor and while not many restaurants were open yet for the season, there appeared to be some nice ones from looking at their menus.