Take a stroll at the great Borough Food Market in Southwark at early Saturday: http://www.boroughmarket.org.uk/ Fine sightseeing options close by are Tate Modern, Vinopolis, Shakespeare's Globe and more. For some exciting dishes for dinner go for Champor Champor in the same area. I have been there a couple of times, and it was a success on both occasions. A place with character and a inspired menu.