My kids Love Seaworld! It's not that bad of drive from DisneyLand Area. If you power walk it you can make all the shows and exhibits in a day. No outside food or drinks are allowed!
Universal Studios wasn't something the kids liked, and weve never been to Knotts Berry Farms or Six flags.
Disneyland California Adventure is pretty fun. The rollor coasters is pretty good, Soaring over Cali is great, Bugs life is good, the Water ride gets you soaked, so make sure you have a rain slick and spare pair of pants! The new Hollywood Terror might be opened.
I think my kids stll prefer good old Disney land however. Disneyland and DGC lets you bring your own drinks and snacks. I did learn that when you pack for the day, after the first hour the drinks got warm, snacks smushed or melted and I was the only one eating or drinking them :ohmy:
Your two way radios will have 8 pairs of idiots on every channel, so I found them not very effective.
Have fun!