Hey guys, I got into the Soc Ph.D. at Davis as well, and had a call with the admissions chair last night to clear up some details. I haven't seen it mentioned so I wanted to bring up the out of state supplementary tuition. If it wasn't otherwise waived on your letter, people from out of state have to pay around $15k extra the first year, until they get their California residency. I was told that as people reject offers, some money might be moved to other people to help cover that first year, so keep that in mind, both for accepting, or letting the school know if you don't plan to attend so those funds can be moved to help someone else.
I'm planing on attending visit day as well, and maybe going a week early to make the most of the flight.