Am I aloud to do a a walk on type to get a campsite of there is any left as of now??

I called and left a message. They soon returned my call, and told me several were emptying out according to their reservations. Then you should drive out and pay, and hold down your site with a tent, because in the several hours it takes to pack up, MANY sites will be taken! Lovely place, but VERY FULL this year!

You should be able to check out the first come first serve, beyond that you can ask the people who run it, they are helpful and nice. :)