Been 20 years ago or more, but my friends from Wallingford CT took me over to New Haven for Pizza - I thought it was awesome.
http://en.wikipedia.org/wiki/New_Haven-style_pizza
And tho' it's probably closed for the winter - I recommend Abbots Lobster in the Rough, on the shore near Mystic. BYOB, seafood about as fresh as it gets.
Hope you have a great trip