London here I come

I am going to London for my spring break with 4 of my friends. We are staying with some band (the michelles) in brixton (i believe, but i could be wrong). I will be there from Mar 3rd till the 13th. I might be able to go unicycling sometime during that period (even though I wont have a unicycle with me), but unicycling aside…I am looking for things to do and ideas of cool places to visit in or around London.