We woke up early, got breakfast, and then shuttled to California Adventure. It had a distinctly different vibe than Disneyland: fewer people, newer stuff. Amy got in a few marquee rides in while the kids and I puttered around in the kiddie areas. With few exceptions, the lines were much shorter than at Disneyland. However, we were wearier, and since we got such an early start, we started to peter out by the early afternoon.
We decided to leave the park and stroll around Downtown Disney. After pretzels, coffee, and (gasp!) cotton candy, we revived, and hit the remainder of the big rides, including Radiator Springs Racer, which had a 2 hour wait! (We had FastPass so our wait was "only" 30 minutes.)
We didn't stay til the water color show or the fireworks, though; after hitting everything we wanted to, we decided to retire to our hotel around 8. That was still 12 hours of theme park madness, enough for even the Huangs. I'd say we got our money's worth.