Wool is good ... holds warmth even when wet.

and you'll catch that "Alaska bug" ... and when you return, head for the interior and check out all that it has to offer. Or head to the Kenai (Homer is one of our favorite places) and explore.

Personally I think Alaska is seen best when you're not constricted by a tour company thing ... do some research and head out on your own ... you'll be surprised how much those tours miss!