You might check out Chapman as well.
I asked because the first week of April will be UCLA's first week of spring quarter. Great week to tour, but they might not list tour times until the student tour guides know their spring schedules. Look for department tours in addition to the main tour. For example, engineering has its own tour.
Are you from Utah? The UCs are notorious for not giving financial aid to out of state students.
USC will have a lot of admitted student events in April. Their big open house is on April 7. They also have an admitted student event on April 3. I would avoid visiting on those days. USC also offers a campus tour as well as department tours. Make sure you sign up for both.