United States
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.
www.conwayscenic.com/
www.santasvillage.com/
www.franconianotchstatepark.com/
www.maine.gov/doc/foliage/
www.visitmaine.com/package/3387/leaf_peeping_at_one_of_maines_gems_-_moosehead_lake/
www.lakesregion.org/Activities/FallHappenings/FoliageLeafPeeping/tabid/95/Default.aspx
Come now, rent a car, get on the pike and head west. The trees are just changing colours, the apples are ready to pick, not to mention the pumpkins, and if you're in luck you might find an apple cider donut... home made almost. Don't forget to try a corn (maize) maze.
The I 90 is the main turnpike road through Mass. At this time of year the leaves are turning, the sky is blue and the rivers and lakes you will drive by on this easy road are glorious. A long straight major road, easier to find than the traditional "leaf peeper" routes up into NH or Maine.
I 90 W out of Boston.
Search Been there