Fun things to do in London?

Basically, I live in Buckinghamshire, in the countryside, but I'm in love with going to London. I'm a HUGE fan of BBC's Sherlock series, and since the characters live in London, I always just love being there. I'm 14 years old, and my sister is 10. My family are planning a trip up to London sometime... show more Basically, I live in Buckinghamshire, in the countryside, but I'm in love with going to London. I'm a HUGE fan of BBC's Sherlock series, and since the characters live in London, I always just love being there. I'm 14 years old, and my sister is 10. My family are planning a trip up to London sometime soon, probably for the weekend. I really want to know some fun things to do in central London. I've already been on the London Eye, and been to Madame Tussauds, so any other suggestions?
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