maleficent

The boat cruise that goes from near Westminster Abbey up to Greenwich is fanastic. There's also another cruise, that's seasonal that runs to Windsor Castle.

Kensington Palace has beautiful gardens surrounding it. Madame Tussauds Wax Museum is kinda cool, but be prepared to wait forever in line depending on time of day that you go.
Westminster Abbey is really neat.

The Fleet Street area holds St Brides Church (the steeple looks like a tiered wedding cake)
THe Globe Theatre if you have any interest at all in Shakespeare.

The Tate Modern is a really neat museum, the glass topped reading room of the British Museum is spectacular, the crown jewels at the Tower of London

The Changing of the Guard I thought was boring,

I enjoyed myself more escaping London and heading to the Lakes Region, or Canterbury or Stonehenge or Bath

If it's a nice day, and only if it's a nice day, the London Eye is great from some pretty impressive views of London. On a clear day you can see forever, on a miserable day, you can't see squat.

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