they're not worth the admission price nor the hassle of parking...
It was no hassle for me at all. Actually parking was easy and fast.
Anyway... The nice thing about California Adventure is that it has this cool section about aviation and space. With a nice Stinson that you can take pictures with Minnie at; the main road painted with runway marks, hangars, etc. The best attraction of it is Soaring California, some sort of a full-motion glider simulator with amazing IMAX graphics. When doing low passes over some orange fields you can actually smell them while having the brisk-fresh breeze all over you !!
There is also a Star Trek simulator which is fun. Rollercoasters and other attractions are a little more adventurous than Disneyland's but far less wild than let's say Six Flags Magic Mountain's.
Six Flags, is just okay, but try to go there before going to any Anaheim park otherwise your expectations will be way too high for it. The rollercoasters at SFlags are well maintained but the park itself is very little attractive, sometimes boring and untidy.
Use two days of your stay in the L.A area for DL
, Cali Adventure and Anaheim. I wouldn't recommend Knotts Berry nor Universal Studios (although the adjacent City Walk is a must). Then, as someone said before, escape the city and drive north or south along the coast!
Have a blast!
There are no stupid questions... just stupid people!