One tip from a Southern Californian by birth and life, the traffic will push your limits, do NOT take your frustration out on those drivers that piss you off, you will spend time in jail if a CHP (California Highway Patrol) or police officer of the city sees you doing such...
And last bit of help, have fun.. I am envious of you, though I just came back from Cali just a month ago, I wanted to go home for the holidays, but wasn't able to do so... So give Mickey and the gang a huggle and a kiss from me... (and if my niece was still working at the mouse house, I could have gotten her to get you and your family into both parks free, one of the greatest perks to working at any Disney park, you can bring up to 4 people into the park for free)