When I came to LA in 2006, my one regret was that we didn't make it to Six Flags. It's a bit of a drive, and we didn't have a car. So this time, there was no way I'd leave without getting there! Six Flags has more roller coasters than any other theme park in the world. All of them break some record or another - it might be the most extreme theme park in the world.
At sunset, when we were leaving the park
The highlight was definitely X2 - the world's only 5 dimensional rollercoaster, where you spin around in every possible direction. Losing my shoe and then catching it when we spun back around was one of the weirdest, coolest, experiences of my life! There's an awesome youtube clip in the post before this one.
We took a sneaky video on one of the rides: The Scream (and you can hear Paul doing exactly that). He chickened out of doing Scream a second time because his glasses were coming off, so I ended up sitting next to teenage girls. My eardrums appreciated it, because the girls didn't scream half as much as he had! I promised to mention, though, that he didn't scream at all on X2. (THAT's how insane it is!)
Next time your shoe comes off on a rollercoaster, I recommend it's the 5D ride X2 at Six Flags, because it will fly away in zero gravity and then come back at you when you flip around again. True story. I caught it!