My wife and I and some of our friends took that cruise a few years ago, and we still talk about it and we always look at the pictures we took. You will love the sceenery. Hope you will have a cabin with a balcony.
My wife brought several bottels of wine on board, without any problems, and you can order drinks to your cabin at night. Also you have to have some drinks in Juneau at the Red Dog Saloon, from the days of the gold rush. If you have any questions check your cruise answer book.
Have a great time.