I go here every year with my Wife. It makes for a beautiful night of holding hands in the crisp air while meandering down candlelit paths between the live musical performances. I love the Native American flute/story-teller. My wife love the "Dickens" carolers.
Get your tickets early as the popular nights (Fridays and Saturdays) sell out quickly. I also recommend to get there early. You'l' be surprised how quickly the night goes.
Dress warm!
It really gets us in the Christmas spirit.