On a hot day there is nothing better to do in London then go for a swim in the Heath ponds. You get completely transported you out of the city as Hampstead feels like being in the countryside except you're in central London?!
Great comic shop that stocks small press, and everything else you'd expect to find. The kids section starts at early ages and has something all the way up.
This is over the road from my house and kind of feels like being transported back in time to the goth night I used to go to when I was 15. But much much bigger with much more entertaining outfits, cages, lasers and… BBQ.