Do a week in the UK. Scottish Highlands, ancient castles, 3000 year old standing stones. Get some activity.
Then visit London. Great walking and history, and restaurants. go to a show in the West End.
(Hilton Tower Bridge is very nice and great location.)
A week left? France, Paris, Versailles. You'll lose walking pounds.
Les Papilles....excellent romantic restaurant, you eat what is served, then walk the Seine afterwards. Under the stars.
https://www.lespapillesparis.fr/
Or
Rome, Florence, Venice, Milan by train. You can set your watch on their schedule...
The culture, history, art is stupendous.
My only reticence is ...hmmm...November.