California Pizza Kitchen has many original, and fun pizzas to offer. I especially love the BBQ Chicken Pizza. The tangy BBQ sauce and the blend of cheeses compliment the grilled chicken perfectly. Make no mistake, the pizza at the restaurante is FAR superior to the CPK Pizzas you can get at your local market in the freezer section, so be sure not to base your opinion on those.
I have also had the Gorgonzola Pear pizza, which I didn't find to be very good. Definitely go for the BBQ Chicken!
Overall, it's a very busy restaurant, but the service is quite good. Be aware, during lunch they will often be so backed up that it'll take well over an hour to get your pizza, but they should advise you if that's the case.