On google it says it opens at 8am and closes at 6pm. And the sign says 6am to 8pm. I want to know which one is right

its 6am to 8 pm I would like to remember park hours normally as sunrise to sunset as a rule of thumb.

There was no one there to inforce anything, just be careful someone just lost there life there recently

Not exactly sure, but if there is a number you can call to find out I would do that. When we went it was later in the morning & it was packed.

If you read the sign it says No occupancy from 8pm to 6am

We just visited 2days ago. It opens at 6am for sure and as long as you out of there by 8pm, you should be fine. It's more of a safety measure in keeping you safe from wild life etc...