You must be somewhere in London
30 galleries, 10 days, 3 cities... So just to name a few:
Richard Wilson's permanent installation
Whitechapel Gallery was up to the third act of 'Keeping it Real', An Exhibition in 4 Acts': 'Current Disturbance' by Mona Hatoum.
Ai Weiwei's Sunflower Seeds installation and accompanying video at Tate Modern (As well as the Gabriel Orozco exhibition, plus their impressive permanent collection)
Anish Kapoor at Hyde Park, Serpentine Gallery:
So there's a start, a few more things that I haven't pictured here but were also awesome: Martin Creed at Hauser & Wirth, Riflemaker, White Cube Gallery, Royal Academy, The Welcome Collection and Hilary Lloyd at Raven Row.
I've also discovered that the best way to find Banksy (and all other awesome graffiti) is to get lost.