Lets see....
Gynecologist - Diseased pussies all day...no thanks.
Porn star - I have a better sex life than most porns and I don't have to do reverse cowboy...no thanks.
President of the US - I'd solve a lot of issues, but then be on trial for crimes against humanity....no thanks.
I'd have to go with astronaut, doubt it will be affordable before I die, and its something I've always wanted to do. But it would have to be a launch day