Is checking for a campground strict to 3pm or can I get in a little earlier?

If no one is on the site I have been allowed access as early as 9 am. They are very accommodating. I love this park.

You can park at the beach while you wait if you have to

Thats correct they are cool about if can let you in early they will ☺

As long as no one is still there they will let you in early.