Strawberry Banke in Portsmouth, NH. Very interesting. Spend a night at "Wentworth by the Sea. http://www.wentworth.com/ It is one of the last grand hotels. Rye Beach, NH is nice. Beautiful view of Isle of shoals.
I already posted here about Kennebunkport. Awesome place. Dot was just under 2 when we went (they say not to give seafood to kids under 2), but we did. She loved those lobstahs, and is still alive today! Awesome vacay!