The Hayward Gallery in Southbank center has held my favourite exhibitions in London and each time they are extremely well curated. Definitely a place to visit !
Also the Queens back garden, these beautiful grounds are great for a Sunday stroll to see the pelicans or to feed the squirrels. Duck Island Cottage is worth a look too, a idyllic little cottage situated in the grounds which was specially built as the bird keepers home.
I personally love photo arts and this gallery puts on some amazing exhibitions by the best artists, such as Vivane Sassen and Gregory Crewdson. The Gallerys’ six-storey space is located right by Oxford Street, so if you are doing some shopping in London, you might as well stop by this gallery. The upper floors consist of two new galleries, while the ground floor hosts a nice café/restaurant. Together with the print sales, the bookstore occupies the basement of the building. I can spend hours just looking at the books, how it is designed, bound, as well as the prints for sale. You can buy all kinds of film; medium format to polaroid film at the store. After some hours at this gallery you just want to go home and start making some photography!