Brunswick has the Perry-McMillan museum on the campus of Bowdoin College -- small but worth a visit. Across the street is the home of Joshua Chamberlain: hero of Little Roundtop at the Battke of Gettysburg, recipient of the Congressional Medal of Honor, President of Bowdoin College, and Govenor of Maine. There is also great musical theatre in the summer on campus. The Maine Maritime Museum in Bath is superb.
I295 is certainly the way to go is you want to go on highways. It's shorter, just as good, and without tolls.
Fwed.