What must I see/ do in London?

Travel Info
I am leaving for London tommorrow! I will be there for three days. What should I be sure to do there? Thanks!

Travel Tips

The London Dungeon if you're into the blood and gore of English history. The Tower of London is also very interesting.

Madame Tossauds was cool, but you go through it so quickly that you don't have time to see much. However, the planetarium that is connected is awesome!!

I think your best bet would be to go on a bus tour (on the top of a double decker, weather permitting). I can't remember the name of the company we used (and they may all do this), but there is at least one that takes you on a tour and has several points where you can get off the bus, explore, then get back on the bus and continue.

The ticket for the one we went with also includes a boat ride down the Thames. We had a blast doing that!

Take at least one ride on the Underground (mind the gap!).

Do not, I repeat, do not eat at McDonald's or KFC!! Get yourself to a pub and enjoy the food they have to offer. :-)
Others

Tell the Queen she's a wanker. Pee on Big Ben & don't eat too much fish n chips! (Joke)
Camden Market rocks, if you're into that kind of thing.
Hyde Park, The new Tate Gallery
Oxford St for shopping, Leicester Square/China Town,
Trafalgar square.. etc etc

Could you be more specific and say what you are interested in ?
http://www.timeout.com/london/
http://www.london.gov.uk/young-london/ki...