Attached below is a PDF with the Parking Garage and Campus Center circled in red.
If you park in the Parking Garage, you can walk underground to the Campus Center from the lowest level. There is pretty good signage for the Campus Center and Hotel from within the Parking Garage.
The parking garage is close to the building, but does cost money. Most of the parking lots around campus allow free parking on the weekends, but make sure to pay attention to the signs at each lot (some are restricted).