First, Welcome to all new DISers!
Questions:
I know its port of los angeles where we arrive in CA but what is the closest location to look for the car rental...Long Beach?

Thanks to the new DISer for the info I was looking for....
Avis is open on Sunday...I'm looking to rent a car after the cruise ends but don't know what's closest...Long Beach?
Also, anyone who has little ones what do you do about car seats?
we'll be in Florida hopefully a week before the cruise so we'll be in my parents car and in-laws and probably renting one as well should we just pay the rental company $ for the booster or does anyone know of any travel car seat we could take..or we'll have to rent again in CA. All the travel car seats I've seen are for smaller children. My DS is about 48" but 46 or so pounds DD is about 46" and 45ish pounds...all of the travel booster type seats I've seen are up to 40 pounds and under 42" I think

Ideas anyone?