4 day Northeast trip with 5 year old
 

We're planning a four day/three night trip with our five year old daughter for the end of August. We're thinking of heading north to escape the hot hot weather. We're from the NYC area but live in South Jersey now. We don't necessarily need beaches because we live at the Jersey Shore. We've done Baltimore, Philly, NYC with her. I have this image of a lake where we could hang out in a small town and go out in a little boat... something kind of idyllic, may or may not be touristy. Of course these are not necessary, just what I have in my head. We can drive or take the train, but I don't want to fly unless the tickets are inexpensive. What kind of advice can you give us?

Cooperstown, NY (?)

New Preston, CT-Lake Waramaug
New Milford, CT-Lake Candlewood
Bridgewater, CT-Lake Lillinonah
Danbury, Sherman, New Fairfield, Ct-Lake Candlewood

Amtrak has a station in Mystic CT. http://mystic.org/
It looks like there is something there for nearly everyone.

Lake George NY
Lake Winnipesaukee, NH
Boothbay Harbor, Maine

Squam Lake, NH http://visitsquam.com/