What is your must-see holiday movie? One random answer will win a $50 Amazon gift card. [Details here]
I'm tempted to say Carry on Camping because it's about people going on holiday. But yeah. Never could get my head around the - particularly American, as far as I can tell - way of using "vacation" to refer to a holiday and "holiday" to refer to a particular day, be it Christmas or Thanksgiving or whatever. I mean, okay, technically that use is closer to the derivation of "holiday" from "holy day", but it's just not what I grew up with. And "happy holidays" always particularly throws me...
But anyway. Christmas movies...Miracle on 34th Street, Love Actually, It's a Wonderful Life, the BBC's adaptation of The Box of Delights (technically not a movie, but hey, it's about as Christmassy as they come). I don't think it exists as a movie, but I've always had a soft spot for Patrick Stewart's one-man Christmas Carol (I know he was in a full-cast adap, but it's not the same), and for that matter you'd have to go a long way to beat The Muppets Christmas Carol. And some of the Doctor Who Christmas specials are pretty good and Christmassy (I particularly liked last year's one, and I suspect this year's will also be wonderful).
So yeah. Pick one from that list. :-)