Gardening museum, South Bank, Westminster Abbey. St James's Park all within lunchtime walk. Oxo gallery I frequently visit.
The other building is a short walk from The National Gallery and St James's Park from the other side.
I used to do all these things with a colleague I fancied for years...and the odd afternoon in the Aquarium, Globe theatre etc. but now al I get is the odd e-mail, well actually not all that odd, qiute normal e-mails really, whereas I used to get odd e-mails from her all the time, though not nearly as odd as the e-mails I sent her. Not to mention the text messages. The afternoon in the aquarium was really odd as well and I'm sure we frightened the sharks and the squiggly things.