1. I will be going there next month. Please add suggestions (or start a new list and tag me in it if your knowledge is vast)
  2. Cabinet War Rooms
    Best coolest thing in London - underground bunker where Churchill and staff planned the war. Maps on the wall with pins showing troop locations left as they were the day Germany surrendered.
    Suggested by @helytimes
  3. Harwich Arms
    Restaurant Warburton put me on to. Delicious versions of traditional English food, in a cool neighborhood.
    Suggested by @helytimes
  4. Greenwich Observatory
    Actually never been myself but recommended to me several times as a great day trip
    Suggested by @helytimes
  5. Bodleian Libraries
    The most amazing archives if you have time to check out Oxford.
    Suggested by @madeline
  6. Duke's Hotel Bar
    Where Ian Flemming invented the Vesper Martini and the phrase "shaken not stirred".
    Suggested by @bobby
  7. Hutong Dim Sum
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    One of the best Chinese meals I've ever had, but that's not what makes this an absolute must: the restaurant is at the top of the Shard meaning you've got the most incredible views of London. It's breathtaking
    Suggested by @Nicholas
  8. Dean Street Townhouse
    In Soho near great galleries. Awesome food and equally important chairs that make you want to stay forever. And they have a fireplace... Which is always a plus.
    Suggested by @gaddis
  9. Yauatcha -- dim sum in Soho. SOGOOD.
    Suggested by @paigeyp
  10. Duck and Waffle
    Also incredible views from the other side of the Thames. Their signature dish rivals the best chicken and waffle in LA. Also be sure to get the beef pastry thing. It's unreal.
    Suggested by @Nicholas
  11. Chez Bob on Haverstock Hill
    5 minutes walk from Belsize Park tube. Have French Toast for brunch and steak frites/ apple martinis for dinner. Also have a look at what's on at the Hampstead Theatre just round the corner, one of my favourites in London.
    Suggested by @Naomi
  12. Bletchley Park
    If you're really into Alan Turing. All the "huts" where they did their work, tons of original artifacts, etc. Hour train, then walk.
    Suggested by @kevan
  13. Portobello Road
    It's a several miles of outdoor market. It was famously depicted in bed knows and broomstick.
    Suggested by @Schneid
  14. Charles dickens museum
    Suggested by @ChrisK
  15. Walk along the south bank
    Suggested by @ChrisK