Remember if your house is dark during Christmas:
1). Keep the lights on! More the better.
2). Have a trusted neighbor pick up your mail/paper and Jehovah's Witness pamphlets. If you'll be away during trash day, ask your neighbor to pull the trash cans in. Or just not do trash that week.
3). Do not tell your gardener, housekeeper, dog walker, contractor, etc. that you will not be home on Christmas
3). Keep a TV/radio on, a la "Home Alone".
4). Minimize packing your family in the car exposed (i.e. Garage door open)
5). Walk around your property and think like a burglar: what's the easiest access pint? Reinforce that entry!
6). Don't have time for a security system? Fake it!
http://www.amazon.com/Outdoor-Dummy-Security-Camera-Blinking/dp/B0013Q1XTM
7). Look out for "scouters" in your neighborhood, man in a car for a few hours in front of house? Call Irvine PD (949) 724-7200. Get the license/make/model of car first.
Christmas is harder for burglars than say Thanksgiving, since people can celebrate on the 24th or 25th versus one Turkey Day. But people are still likely to travel and be far away for a whole day.