I see that check in time, is 2:00. Does that mean you have to check in at that time, or can you check in, say at 3 or 4??? Already paid, in advance.....

Yes, you can check in later since you have paid in advance. Your campsite will be reserved for your arrival. Enjoy!

After 2. If paid, reserved spot will be available for you.

You cannot check in earlier than 2. If you're already paid up a space is held for you until the next morning.

You can check in any time after 2pm (that's also check out time).