You could always do what I did last yeat, havd it delivered at work, and they didn't tell me where it was until 2 days before we were to open it. They did let me know it was there and let me look at it once, before it was "hidden".
Although in the end, all the girls wanted to open it for me.
Hmmm, that worked so well, I may have to get them to do it again this year. Really cuts down on your ability to cheat and sneak peeks if you have no real idea of where it is.