If you woke up one morning as the opposite sex, what would you do with the rest of your life? What's something, (if there's anything,) you've wanted to do but have been barred from by the traditional roles defined by your sex?
Some days I'd kill for a deep male singing voice. ("STAAAARS! IN YOUR MULTITUUUUUUDES!") And the ability to grow copious facial hair. (Instead of the creepy ONE that keeps sprouting in different places on my chin despite rabid plucking...)
Both of which are rather petty, I suppose; but there they are.
EDIT: Though now that I think about it it would totally suck to have external sex organs. D: Waaaaay too exposed. I'm clumsy enough without sacking myself on things, too.