Holland is a great cruise line. I have gone on 2 of theirs with my Mom (one to Alaska and one Asia and Australia). I agree with taking warm clothes depending on when you're going. It was still pretty cool and we went the end of June for the Alaska cruise. Enjoy yourself. Check what side trips they are offering. There is a quilt shop in Sitka and I believe there are ones in Juneau. I found one in Ketchican.
We saw the Mendenhall Glacier and Glacier Bay. I went thru the Mystic Falls area on a tour.