The first thing I'd do is fill David Cameron's shoes and clothes drawers with sand. You can never get rid of sand.
After that I'd go to Adele's house and change the lyrics of all of her upcoming songs to happy ideas, instead of WAH WAH WAH MISERY HE LEFT ME BUT IM STRONGER THAN HIM NOW SO THERE
Followed by a quick stop off at Boris Johnson's gaff to tattoo the word 'buffoon' on his forehead.
After that, yeah, I'd go rob banks and stuff. Board a plane to the Bahamas and sit in first class quaffing champagne until the clock restarts.