Quick, easy, cheap thai food. It's fairly new to me, but easily makes this list.

A beautiful, neon-fronted, old school, single-screen cinema on Upper St. That anyone would choose to go to the Vue just up the road is baffling

A peaceful park in Kingston Upon Thames. You can see lovely houses and gardens across the river. It's a wonderful place where you can take a rest with your family or friends. I recommend you to take a walk after having lunch or dinner in riverside restaurants near to the park. It's not big, however, very enough to feel the beauty of nature. I've done some location drawings here which was quite exciting. Just seat on a bench and enjoy the comfortable atmosphere. 

For its seasonal changes, the rose garden, the Serpentine, the Serpentine gallery, the Summer pavilions, the café etc.

The Almeida, in Islington, is a small theatre with big influence. It's an intimate place to discover groundbreaking theatre and get up close to some of Britain's leading actors. The cafe/bar across has a constantly-changing tasty menu, relaxed atmosphere and free wifi. Open all day and great place to spend time even if you're not going to catch a production.