It's been several years since I've been down to CBC - great place in a great setting. Can't remember if I've tasted this IPA though.
The website doesn't give much info:
"Brewed within a mile of the pacific ocean this west coast IPA sweeps the senses with its intense hop bitterness, complex flavors and aromas. The Islander IPA pours a nice copper color with a medium body and maltiness. Silver medal winner at the 2007 L.A. County fair. (7% ABV)"
I agree with krug above - you don't need to add orange or lemon zest (it's not to style and I'm sure CBC isn't adding it either). You just need some really citrusey hops - Cascade, Centennial, and Amarillo come to mind.