Welcome aboard!
I was on the Voyager over Thanksgiving and loved it! The ship is beautiful, food great, service great! I don't know if they do a big bunch of decorations for the holidays but would imagine they do - nothing drastic for T-giving, probably because it's primarily a US holiday, but I'm sure there will be something for Hannakwanzmas <img border="0" alt="[bang]" title="" src="graemlins/banghead.gif" /> .
If the family doesn't like the fact that you'll be gone for the holidays, tell them to come along!!! <img border="0" alt="[naughty]" title="" src="graemlins/naughty.gif" />