So if the park has business hours, how does the camping work?

If you're going to show up after hours email or call them and they will either leave the gate open for you and ask you to close it when you arrive or someone will come meet you. I've had to do that before

What Danielle said. Call them and they will help you anyway they can.

Thank you Danielle Eaton. I had no idea until you've enlightened us.

I never camped there so I do not know. Sorry.