British Vacation

OK, a little help from anyone and everyone:

What is the Top Spot to see (or Place to go) in Britain, i.e. England/Scotland/Wales? I've been there several times, so has the hubby. We are going for a wedding but then want to use the rest of our vacation for "fun."

[Not that the wedding won't be fun, but I don't think my niece and her fiance/husband want us following them around for 2 weeks! ;-) ]

Feel free to poll friends, relatives, coworkers, whatever. Keep in mind there is an 11-year-old in the mix -- but his only request is to run at all the barriers at Kings Cross Station. There's a hour killed...

People have suggested a Harry Potter movie-location trek, but they filmed all over the bloody place!

TIA!