Is there public parking? And what is the parks hours?

You can park inside by paying entrance fee of $3. if you park your car outside, it's accessible all the time and free

The park opens at sunrise & closes at sunset. Free to park outside the entrance; $3 to park inside the gate.

Yes, parking fee for all day $3.00 annual parking fee for only san dieguito county park for only $25.00 and for all county park fee $40.00