This sounds like SUCH an amazing trip! (We happen to be going to be at Disneyland at the same time, btw!)
I know you have everything planned out, so there probably isn't time to in the schedule to add things, but just wanted to mention, since you're going through Gilroy, that my 8-year-old daughter and 5-year-old son love Gilroy Gardens. (It's about a two-hour drive from where we live in the Bay Area, and we end up going a few times a year, often on our way down to Monterey. It's just a very sweet theme park--none of the rides are very scary, but the horticultural theming is awesome:
https://www.gilroygardens.org/
Also, since you're going to Universal, wanted to mention that my son, who isn't normally afraid of ANY ride--he's gone on ToT, all the "mountains," etc.--found Transformers really terrifying because it is super loud. (He didn't love Simpsons either, actually.) Transformers was even way too much stim for me!