Keeping Thailand trip secret?

Anyone ever go to Thailand without their wife finding out? I may have a window, but I definitely can't say I'm going to Thailand. I would also probably have to get a secret credit card going to a P.O. Box or something, which seems like a hassle.

When I went last year I simply told her I was out of town working. On the flight back I bought the wifi because she kept texting me. So I could text back and made up some excuse to be late.
I have a Charles Schwab account that I fund without her knowing.

That would be one hell of a secret, let us know how it works out for you.