Well, if I am bound by the rules to be completely selfish...
1. Unlimited wealth. Because...c'mon.
2. A healthy, strong body. Being 56 with two back surgeries behind me is really grinding me down.
3. The ability to be instantly, natively fluent in any language I encounter (and I get to define "language" as I see fit)
To Splunge's point, there's nothing about the rules that would prevent you from wishing to change the rules -- one could wish that one weren't bound by the injunction against wishing for more wishes.
But in keeping with the spirit of the question, I think mine would be:
1) To be, physically (not mentally), a young adult again. As a gay man, I stayed in the closet way too long and I'd love to have those years back to live on my own terms.
2) To be rid of my lifelong anxiety disorders.
3) It's hard to decide on this last one. I would either choose to be immune to all infectious diseases, viruses, etc., or I would choose to be a mathematical genius. I didn't discover the wonder of math until fairly recently in my life -- and while it's not too late to get caught up on things like calculus, I'm not sure I really have the time or mental discipline to do so at this point in my life. That said, I'd probably go for the former option given that it would mean greater time and freedom in the long run.