Planning my next UK trip

I really do enjoy planning almost as much as traveling. I am excited about going back to England. It is a work trip - I will be busting my arse Monday - Friday, but I am leaving a day early and staying an extra day for fun stuff.

I know I want to see at least one show in London. And, I am consulting "the book" to get inspiration on other activities to do or sights to see. Options I am considering....

Brighton
Cambridge University (I've seen Oxford)
Kent
Southampton
York

And....if I had a bit more time I could head North and try to find the Loch Ness monster.

For theatre... this is what I'm considering:

Breakfast at Tiffany's
Chicago
Hairspray
Othello
Phantom