The best thing to do is make a reservation since its a heavily used area. Plus with the road construction on highway 1 It is cut in half and does not go all the way thru last time i was there in October. I don't know if it's available, you might be able to reserve a camp site right behind the Pfeiffer falls. It has to be one of the most beautiful scenic campsites in the world and I'm not exaggerating.
You can check at the station if there are any cancellations usually around 3pm.
Why do I feel like people are against first come first serve type persons?
Don't know but we walked through one with the trails and it appeared to have people living there long-term not camping
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