Wow. Thank you for all the wonderful advice. This is our first international trip with our daughters and really for us in many, many years. We usually take road-trips, so it will be a new experience to not have the freedom and flexibility of a car. I appreciate the thoughts about worth of day trip to Stonehenge from a time, money, and value perspective. The girls are interested in going...and we are definitely intrigued by the mystery. I can see us standing there imagining the stones being moved into place and the reasoning. :) But, we'll see when we put together the final itinerary. (I like the idea of including it with a trip to Salisbury and/or Avebury.)
Again, thank you, for the many different thoughts about afternoon tea and suggested locations. I have made some inquiries based on the suggestions. I found out St Ermin's can accommodate 10 guests. I like the idea of a very special experience for our families at Fortnum and Mason, but as was mentioned, we've done the math and it is quite expensive. I did find out that they have a children's menu for half the price. And, I was thinking about having it for an early dinner to justify the expense. We might decide to split into two tables or try the V & A Museum or St. Ermins for a less expensive, but better shared experience. We'll see.
And, all the other recommendations...I hadn't read about the Museum of London, which looks great! Camden Lock Market, Thames Rib experience (speed boat), Evan Evans tours, castle suggestions, London walks co, and much more. I need to remind myself that we don't need to see/do everything!
I'm excited for the new post on British vs American Terminology.....I'm familiar with some common sayings...but didn't know that I shouldn't say "fanny pack". Thanks again!