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.
Slightly biased as this is where I live, but Stoke Newington is great place to spend lazy saturday / sunday afternoons getting sloshed with friends. There are 10 + pubs within walking distance who all are great places for one reason or another. I'll pick out the White Hart for its huge beer garden...
If you want a peaceful day out of the busy city, Highgate doesn't really feel like London. The cemetery is interesting and peaceful, there's a tour of the old half which is definitely worth the money. Karl Marx, among others are buried there.
'The People's Supermarket' offers an alternative to the conventional supermarket chains and focuses on community and local farming. Offering high quality, healthy food at reasonable prices and providing British produce where possible 'The People's Supermarket' highlights the possibilities of consumer power. Become a member and you will be entitled to an ownership stake in the store, which means you have a say in what they do. Membership also entitles you to a 10% discount on all purchases in the shop.
One of those rarely found shops that inspires one to craft and creativity. A huge selection of high quality papers to print and draw on, to cut, fold, glue or just wrap presents with.