I would ask if you drink out of control or not?
Not what you think, but what your best friend thinks though. (someone that'll tell the truth).
Beer or Boat eh? Well, let's say you give up the boat. You're still drinking and doing other fun stuff I imagine and she's probably still pissed and will want you to give up whatever activity you're doing that involves beer. Its gotta be the beer.
Good luck, I've never been married. ugh, makes me reconsider the thought now!