There are some on this page

http://www.mahalo.com/great-wolf-lodge-coupons

But it depends on which one you are at.

My wife had to go someplace for a business meeting and reserved the conference hotel a bit too late to get rooms. Her and a few others were put up in the overflow hotel, a Great Wolf across the road or whatever. She said it was hysterical to see all these business people coming to breakfast in their suits while the kids were already soaking wet in their bathing suits.