I agree with everyone that this is cheating. But everyone's moral compass is set differently, and this is supposed to be a board about sharing tips and the like.
One thing I've seen suggested on this board is to delay the purchasing of passes for one of the people in your group. For example, if you're going to be there for 5 days, a child's MYW pass would be in the neighborhood of $200 or so, or more if you want extra features. If you get asked for the AP at check in, tell them you haven't bought it yet, and then buy it for the child. For an extra cost of about $180, you get your room discount. If they don't ask, buy whatever pass you were going to buy.
Some thoughts on this: (1) Obviously it only works if your room discount is steep enough and you're going for a multi-day stay. (2) There's nothing to keep them from asking you for your AP during your stay, in which case you're going to get charged rack rates, which, frankly, I wish they would do from time to time to keep it honest. And (3) make no mistake about it, this is stealing. If you're ok with that, so be it, but at least acknowledge it is what it is.