I'm taking my first Alaskan cruise on Sunday, so I can provide recommendations when I get back. I'll be 30 this year, and I'm going on Princess Cruise Lines, which also goes round trip to Alaska from Seattle. This will be my first time on Princess.
2007 - Majesty of the Seas (Bahamas)
2009 - Enchantment of the Seas (Western Caribbean)
2010 - Freedom of the Seas (Western Caribbean)
2013 - Golden Princess (Alaska, roundtrip from Seattle)