1995hoo, my family and I did that road trip back in 2009, I think. Don't miss Valles Caldera preserve in northern New Mexico, one of those freakishly beautiful spots the wild west specializes in. It's an old volcanic caldera (and I mean
old), and when we visited there were herds of wild animals wandering around the basin. Quick hiking trail.
Santa Fe has great art galleries dedicated to everything from Georgia O'Keeffe to Chuck Jones (a.k.a. the Looney Tunes guy). The town square has a Civil War monument with, as I recall, a really glaring typo. Taos is great if you like hippies, or if you like making fun of hippies.
Do you like Breaking Bad? You can always hit up some filming locations, like
Walter's house, or the
Grove Cafe, where Walter and Laura meet in the final season, which as it happens is a pretty awesome lunch spot where my folks and I had some terrific sandwiches. I think they actually filmed the scene there because they already liked eating there.
White Sands is awesome but my friend dropped her keys and never found them again, so if you go to White Sands, don't drop anything. And here's another thing I can say from personal experience, if you go to the aliens museum in Roswell and laugh at everything, they WILL kick you out.