The University of California, Davis is located in Davis, approximately fifteen miles west of Sacramento. Davis is accesible by two freeways: Interstate 80 and California State Highway 113.
The nearest airport to Davis is Sacramento International Airport (code SMF). Alternate airports are Oakland International Airport (code OAK, 77 miles from Davis) and San Francisco International Airport (code SFO, 84 miles from Davis).
Amtrak's Capitol Corridor line runs through Davis with daily service.
The closest airport is in Sacramento (SMF). To get back and forth between the airport you can either:
The map below of campus in relation to Davis is courtesy of Visiting UC Davis.

The map below shows the southern half of campus. The Mathematical Sciences Building (MSB) is just south east of the center of this map. MSB is north west of the Mondavi Center (pictured in both the maps below and above). An interactive version of the map is most helpful, and a PDF copy can be viewed/downloaded here.
Visitors permits may be purchased in Visitors Parking lot 47 (VP 47) for $6.00. There is no free parking on or near campus. VP 47 is the closest parking lot to the Department of Mathematics and is located southwest of the Mathematical Sciences Building. Additional details can be found here.
The ideal place to stay in Davis is in downtown. Downtown is very small and easily manageable by foot. Once in downtown, you have easy access to dining and campus.
Some downtown lodgings include:
If you will have a car and do not need to stay in downtown, you can get a cheaper rate on a hotel in Davis at: