My first wish would be to have the power to shapeshift.
I love being around animals and want to be able to turn into one. I think this generic ability would also include being able to turn into other human beings, which would be a funny prank.
I would love to be able to snoop around by turning into something small, or scare people by changing into a tiger or something. I could trick people, scare people, and it would add some enjoyment to my life of stress.