This was our second cruise ever, first was on Disney in the Caribbean. So I have a bunch of ins and outs in here that I hope are helpful to the newer cruisers looking for some dope on the RCCL line in Alaska.
First off, our cruise was great. We left Seward on July 4, southbound to Vancouver on a 7 night on Radiance. She's a big boat, but not as big as the Dream we'd sailed on before. And the crew kept talking about the Oasis which is 4x wider and 6 decks taller and holds 3x the people and crew. Holy cow!
We had a great set of weather, with sunny skies in every point except Icy Strait where it was merely overcast and drizzly. Unheard of, according to many familiar with the cruise itinerary. So, first off, bring long pants, and a jacket, and you need to have a rain shell, seriously. Don't think it will be warm enough to dry in the air either. It was 70s most days even in mid July. You also need warm clothes for being out on deck on the boat during sailing days. And at the glacier. I packed for summer, with a couple warm things. Do yourself a favor and pack for Fall with a few summer things.