Ok so it's getting tricky.
Wife is banging on about going back to Disney. Constantly researching prices. How much longer before I can reveal I've already booked in secret??!!
Oh geez. You do have a predicament, don't you? I guess you should probably take her into your confidence.
Here's why. Remembering of course, I don't know your wife at all: She could become upset if you don't tell her pretty soon, with the fact that she's put much effort into seeing what is available...
Or, and this could be more dangerous: She could come up with a plan that is different than your's and like her's better!
Yep, better let her in on it.