It's not the most exciting thing to do during the holidays, but if you're on a date or have kids, you'll have fun. We went on Christmas Eve and while it was crowded, there was still enough room to walk around and see all the lights.
Don't come here expecting to see any real animals. The exhibits for them aren't lit up, and they're either sleeping or hiding. If you like looking at pretty lights strung up in trees, seeing lights in the form of animals, and walking around a scenic atmosphere, this is your place.
The lake area with the lit up light show and music was one of my favorite parts of our experience here. Every few minutes the show will refresh with a different song and light show.
P.S. They sell discounted admission at Fry's, but it is $1 off the weekend price. Note that the weekday price is still cheaper at the entrance than buying from Fry's.