Personally, I would ask myself some questions.
1. if you go, and do wean before you go, will you feel guilty? will you regret it? is it worth it?
2. If you don't go, how would you feel about it? Would you have negative feelings towards your child?
3. If you were formula feeding only, how would you feeling about the trip, and leaving your child for a week? Do you think you'd get through the 7 days?
For me, whether i was breastfeeding or bottle feeding, it would be a definite no on leaving my baby for a week long trip. I just wasn't ready. The inlaws wanted me to wean her so I could "leave" her with them for a few days, but I declined, DH thought it was because I was BFing, but I explained to him that it was just not our time, we were not ready, and it wasn't BFing that defined that for me.
I have so far skipped many opportunities, yearly conferences I would have *LOVED* to go to, because I have a nursling. It's tempting, but I think about it this way: My daugther will only need me so close for a very short period of time. In the overall years of her life, to give her my presence when she needs it the most for a year or two, is I believe, my priority. There can be many trips, many conferences, many whatevers. But there's only ONE of you and ONE of your child, and ONE breastfeeding experience.
I don't regret putting off things. I am very happy with those decisions, and very happy with how long I've nursed my daugther, who looks to be starting to wean all on her own (well, I led the night weaning, but she's led the rest). Looking back, now that I'm "at the other end" I'd say treasure it. Hold to that little baby, and know that you're doing the best by breastfeeding your child.
If you do decide to go, know that pumping, stashing BM for your child in advance can be done.
If you decide to wean, beware that your trip will probably not be "milkless" and if you stop abruptly, you can cause painful engorgement, and even a breast infection. So do it gradually, or take the pump with you and pump out a little to make yourself comfortable.
My DH was bugging me about a trip "just the two of us" too, but I passed, and now that he sees his daughter growing happily, and weaning at her own pace, he understands better why I did so.