Head north into northern New Hampshire or Maine.
Get a car and drive up I93, keep going up towards Franconia Notch or deviate and head for the 'Lakes'.
Titlon and Conway have shopping outlets (NH has no sales tax) and there is the Conway Scenic Railroad which will provide you with a steam rail trip through the autumal colours.
Alternatively, head up I 95, stopping for lunch in Portsmouth NH, and up into Maine. Head north to the mountains.
Both are beautiful, inexpensive (especially with the current exchange rate) and away from the usual UK tourist spots.
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