Here’s some tidbits and questions, in no particular order:
According to the online sources of Cal. Rules you have 30 days to appeal, by filing a “Notice of Appeal” in the same Superior Court as your trial.
If you want to hold off paying the fine while you appeal, you would file a motion for stay of execution, first in your trial court and if he denies it then you file one in the appellate court. I don’t know if it tubes your appeal if you just pay the fine or not. (Where’s our Cal. lawyers in this group?)
Was your case prosecuted by an attorney or the Ranger/policeman? Did they testify that you took off/landed in the park or just that you were flying over/in the park?
They clearly purport to regulate all aircraft who overfly the park. See regulation 905.1, applies to all aircraft who drop below 500 feet, not just drones.
Judge decided it same day as trial, safe to say his comment to you shows he had decided the case. Hmm, at what point did he make the comment? Was the trial recorded?
Both you and he are 107 pilots. Hmm . . .