C.S.
A.,
I know that it is hard to dump but really the purpose in pumping is two-fold: to have the milk, but mainly to keep up your supply so you can continue breastfeeding when you get home. If you will be gone longer than a few days, plan to dump what you pump at the beginning and save your last few days.
I had to travel a lot in the job that I had when my son was an infant and I only kept all the milk if I was gone 2-3 days. Anything longer than that, and I kept the last 2-3 days. I was a "good pumper" and could easily get 8-12 oz per pumping so storing all of it and carrying it back frozen was simply too much.
Call ahead to your hotel to make arrangements and don't be surprised if you have to make new arrangements when you get there. Be flexible and know that what you are really doing is keeping your supply up so that your son can keep breastfeeding when Mama gets home:)
Good luck! C.