I would say park hop. There's more at California for younger kids to do and enjoy than for adults, but even if you're traveling with kids you'll probably be done by late afternoon possibly early evening.
For sure check out the Alladin musical, get your free tortilla sample at the Mission tortilla factory, fast-pass Soarin' and Tower of Terror, and if you have a Disney Visa card and you're interested in the free 5X7 meet and greet photo keep in mind that it's only at California Adventure and it ends at 11:30 am, location is Ariel's grotto restaurant. <----- now that was the info when I went a week and a half ago, it may have changed??? (first time I've done it).
(Don't worry about backpackin' in your own sodas, we didn't have any problems during search and the park is nice about giving you a cup of ice. $3 bucks a soda vs. $2.50 12 pack).