Acadia NP/Bar Harbor, ME
Freeport, ME (if you like to shop)
Ogunquit, ME
Kennebunk/Kennebunkport, ME
Cape Cod, MA
North shore, MA (Salem, Newburyport, Rockport, Gloucester)
Lexington/Concord, MA
White Mtns, NH
Stowe, VT
Colonial Williamsburg, VA
Gettysburg, PA
I wouldn't bother worrying about "don't waste your time". Your interpretation of an area will be completely different than someone else's. If you can be more specific about what you like to do then narrowing down where to go becomes easier. If you have no specifics then just make a list, start with #1 and keep going.