How should I do my hair for my girlfriend's sweet 16?

I have no idea how to do my hair. I don't like to label myself but I'm a metalhead and I have really long hair. It's passed my nipples and almost to my ribs. I'm not going to cut it because I didn't spend 4 years for nothing so should I put it in a pony tail or should I leave it down? If you say a braid or corn rolls or whatever you are a dumb a$$ I want a serious answer. Btw Im obviously gonna be wearing a tux.