Gigsed, I moved to Irvine around 3-4 months ago. The PT thing is SO TRUE. I, too, am a completely walking/biking kinda person so it has been hard to adjust to always having to drive ( a lot of which is on highways- ugh). The area has a lot of great biking trails but biking is more of a leisure thing here than getting around since distances are pretty long.
Having said that, the campus area is nice and I have seen a lot of students biking around there. Student housing, at least from the outside, looks pretty good and there are quite a few grocery and eating options within the campus. I have been to the UCI library a few times and its pretty okay. As for reputation, UCI Anthro is really one of the up and coming departments in the US. My professors at UPenn all said this same thing when I was moving out here and wanted to know about the department.
The weather is absolutely lovely here all year round - as you MUST have heard already. This also means relatively low living costs as far as heating and electricity bills are concerned but of course, this is one of the most expensive areas to live in otherwise (high sales tax, not many cheap eating options although enough to survive, transportation costs etc).
That is my general impression of the city so far.
Congrats on being accepted and good luck with the rest of the schools! (: