I don’t know of a book but you might look at DayTripper for suggestions on UCLA and Berkeley
This will be good centralized thread for suggestions from CC members.
UCLA has a hotel on campus. It is pricey but convenient. UCLA Hotel | Luskin Conference Center | Los Angeles, CA
I would recommend the info session and regular tour. If your student is interested in engineering, make sure you take a tour of the engineering school as well. @10s4life is an excellent resource for UCLA engineering if you have any questions.
UCLA used to give dorm tours but I don’t believe they do anymore. Regardless, walk over to the Hill and check out freshman housing.
Westwood is adjacent to campus so take time to walk around town. Visit Diddy Reese for fresh baked cookies.