It was hard to decide what to pack. For us deciding what shoes to take so that we didn't have too many was tough. We went with the tennis shoes we wore on the plane, lightweight hiking boots that we waterproofed, and dress shoes. You can wear jeans to dinner on casual nights, many people did. I just took some nice black slacks that I wore with different nice tops for the formal, semi-formal nights and to Palo. My DH and DS just took one pair of kahkis that they wore with different polos and button down shirts with a tie for those nights. Alaska seemed to be more casual than the other cruises we have been on. We also took clothes to wear for layers, t-shirts, long sleeved shirts, sweatshirts, lightweight water proof jacket, thermals, knit caps, and gloves. We were there in 2013 when Alaska was having a heat wave so we really didn't need a lot of the more winter type clothes, except for when we went up to the glacier to do the dog-sledding. Just remember, you can always do laundry of send your clothes off to be washed. Have fun!!