It is an independent arts organisation in Elephant and Castle. It is one of the best venue for electronic music in London. On Tuesdays Boiler Room, best DJs for free with guest list.
Maybe an obvious choice, but the Barbican is always good. My favourite space in there is the curve gallery, last time I went was for Cory Arcangel's 'Beat the Champ'. I love the architecture, although not many people do. I think it was voted 'London's ugliest building' in 2003.
It doesn’t happen very often but its one of those things that brings people together. Running to the park or hill with anything you can find that might work as a sledge with a big grin or your face.