The Access London guidebook (which, by the way, I really like) has inclusions throughout the book called "The Best." These are lists from Londoners of their favorite things to do. An example: "Watching the sun set over the Thames from the walkways of Tower Bridge, now open to the public." Now, that is something I would never have thought to do, but it sounds like a wonderful way to segue from daylight to dark.
I am quite interested to learn what the knowledgeable TALFers would put on their list of The Best.
All ideas will be welcomed! Thanks to all of you for your great input. It is time to do the tough-decision planning as we leave in 12 days!