Is there a place where you can park additional cars if the park is full?

Parking is alloted per camp site reserved. To liquor store as you come off the main state route as you wnter tje park has additional parking $20 a car. And we shuttle people back to the camp sites

There are couple spots here and there along trails and such

There are a few places (very limited) dispersed throughout the campground.

I don't recall seeing any additional parking

I believe your guests can park at the ranger station.

Where?

Yes