I hope you aren't flying into ONT, otherwise you may find yourself addicted to the FREE WiFi (48MB/s) service. See my post labled "Not good. Does this make me an airport junkie? " if you're curious.
Enjoy LA ... this was my first time here myself, but spent the entire time in the Chino area and didn't get to see anything. I hope to see more when I goto Pasadena in August. Anything a must-see in Pasadena?