Disney California Adventure does not have very much Halloween Decor. :(
We are on the Golden Zephyr, which is not scary at all! But you can see Mickey's Fun Wheel, otherwise known as Mickey's Wheel of Death. It has a lot of cars that swing really really far on a track. I also know a lot of people who are terrified to even ride on the non-swinging cars! They think it is the scariest ride in the park!