i've being several times becuase i live over here. Personally i love it. Go see tower bridge, tower of london, London eye, Houses of parliment, big ben, then after big ben, walk through st. james' park down to buckingham palace. Another less known part of london that i love is greenwich town and the area around there. Theres a huge park with the royal observatory at the top of the hill, the royal naval college, and naval museum and the cutty sark, britains oldest boat. Great place, so long as the weathers good