Hmmm, makes sense that there should be another thread on this somewhere, but I can't remember it. Let's see... Now if I were younger, I'd have no problem answering this, but the problem with growing up is you're not quite as free with your imagination.
1. to be able to talk to animals (think of the bariers that would be broken!)
2. the power to know and do exactly what would make me the happiest (Does this make sense?)
3. Drumroll please!
World peace.
Good topic!