If you have the budget consider renting a cabana. Great Wolf Lodge Manteca tends to overbook so it's crowded with limited seating!
Great Wolf Lodge Manteca has several restaurants however the wait times tend to bring long. Bring snacks and drinks and store them in your room.
The Great Wolf Lodge Manteca website offers deals as does many local Groupon pages.
Consider doing the pre-check-in so you wont have to stand in the long check-in lines!