We have done 3 trips to Alaska, one on Holland America and I am redy to go back. You will need a varity of clothes, so take things you can layer, and some toss away rain ponchos. We have had 90 degree weather in July and 45 on the same trip. Enjoy and congratulations on your 40 years. That was our first trip. We just did 51 years on the 26th.