We're going to the O2 to see Peter Kay in November and have babysitters from lunchtime on Saturday to lunchtime on Sunday. We're keen to do something fun in London that we wouldn't necessarily to do with the kids. Any suggestions of how to fill a potentially cold and wet Saturday afternoon and a Sunday morning that isn't a million miles from the O2? We're open to museums, parks, views, markets... We've done a river cruise, London Eye, Aquarium, the Natural History, Museum, Dopamine land and open top bus tours in the past. Thanks!