Yes
You can certainly turn up and find a spot to pitch a tent in the picnic spots, most of which have grass areas. First come first served arrangement.. You can only pitch a tent in the camping spots if you have an overnight camping reservation. Entry to the park by car is $5, unless you have an OC Parks membership. $5 fee is waived if you have a camping reservation, which is $20 nightly. It's a very nice park, I highly recommend it
Yes. Just avoid major holidays, Fridays, Saturdays and a majority of Sundays.
I would call them at least and not just show up without a reservation to see if they have space. Campsites are usually booked in my experience months ahead of time. This place has multiple sites so ask them over the phone if you can reserve and pay with them then. I did everything online months ahead of time. It also depends on what you need. If you need a trailer or RV hookup, those are even harder to find. There are other campsites around as well that are more primitive and are usually first come first serve as well as other options.
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