I spend two days in Disneyland and Disney California Adventure and quite frankly that was only enough because I was there from nine in the morning until ten at night. If you have kids you need at least double that time.
As I have been there before I concentrated on the new big ticket rides like Star Wars and Indiana Jones but I also really liked the roller coaster in California adventure and was again amazed at how clean and well organised the place is. The evening show of Fantasmic was fantastic indeed with everything from pirate ships to dragons, fireworks and laser projections.