Last time there was the Great Wolf Lodge 48-Hour Sale. Many folks booked the trip to go there in December.
Other than enjoying the indoor water park fun, there is a possible place to get good food near the resort. Driving about 5 minutes, there is a Grand Buffet at Lucky Eagle Casino. It is said that it is a very good seafood buffet. With multiple families, some say you could also order All-You-Can-Eat buffet dinner there.
The location is
Lucky Eagle Casino & Hotel
12888 188th Ave SW, Rochester, WA 98579-9643.
The place is a single-story house. If you have kids, you need to go from the other entrance.
Updated: Great Wolf might still have the 48 hour sale? If it has, it is the biggest of the year. Someone mentioned on the web that it is valid on stays from January through April. Use coupon code 48HOUR to get up to 20% off your stay. Not sure if it works...