We ended up riding Little Mermaid two or three times in a row one day because it was so hot, LOL!! When we were there last June, two of our days were freezing in the morning and the other three days were some of the hottest days of the year. It was crazy.
California Adventure was my favorite of the two parks by far. California Screamin' was our favorite ride, but unfortunately we only did it once! When I was there, it was when they'd taken away the option for multiday photopass, so if you wanted it you had to buy it day by day. I think it was $39 each day, so we only bought it for our first Disneyland day and our first CA day.
Our first morning at CA, the park was empty outside of the FP area for Cars (I also did the rush in and stop in front of Carthay Circle with a few hundred of my closest friends thing!), and my kids rode Goofy's Sky School once with me and twice by themselves...they loved it, and I did like it more than Primeval Whirl. I think it's slightly less rough??
We did the stationary side of Mickey's Fun Wheel, and it was cool to see the view, but it was annoying that it constantly stopped and started to fill cars. I wanted to ride it once around at least without stopping, but nope. That was disappointing, but I really did love the view!!
Can't wait to see how you liked Radiator Springs!!