I went to Alaska in May 2005, if I can answer any questions, please ask away. I sailed on NCL Star. Sneakers were a must to pack. I wore them in port and around the ship. I changed into dress shoes for dinner.
Pack a sweater/sweat shirt for the theraters the A/C is freezing and I am typically never cold.
Make sure to have a rain coat packed, just a light weight one. Dress in layers while in port
Norwegian Star May 2005 (Alaska)
Norwegian Wind September 2006 (Hawaii)
Norwegian Pearl October 2007 (Caribbean, back to back cruises)
Norwegian Dream October 2008 (Bermuda)
Norwegian Spirit September 2009 (Bermuda)
Caribbean Princess May 2010 (Caribbean)
Yes, do pack your sneakers. We went to Alaska the second week in Sept 2008. It sure made walking in the ports nice. All the advice I received from cruisemates about dressing in layers made my trip very comfortable. I am glad I listened. For once, I did not overpack. Very good advice here.....