We've only gotten a tree one year because we're usually out of town. This year, my grandma is coming to visit for Christmas, so we're going full on deck the halls to celebrate her visit. The tree will be real.
Also, I live in NM where it's traditional in many areas (including my neighborhood) to put luminarias out in front of your house on Christmas Eve. People walk around the neighborhoods (and drive if it's not their neighborhood) to see the streets and houses lined with thousands of luminaries.
Here's some pictures of the luminarias. The first one is of my house (I'll have twice as many this year), and the second is from a street in my neighborhood. I guess it's time to start the Festivus thread!