for one day, what would you love to do that would be quite outrageous, you could see others but no one could see you, I would irritate the chavs when I hear them swearing and hurling abuse at people by giving them a hard slap or a kick in the shins to see how they liked being hurt!
I go to a place that is known for being haunted and watch the shock on peoples faces when I move objects in midair and knock things over. I'd also punch my sister in law in the face. Now I wish I could be invisible.