My experience is that they are closed on Christmas day, but you can reserve a spot and stay through Christmas. I have camped through many holidays, but the office closed on those days. Some parks have a pay at the box honor system that you can submit a form along with a payment on hours/days that they are closed for business.
Yes, but you would need to get there EARLY - this is busy season and park is closing by 9am most holiday periods; after 9 you might get lucky and nab a pass for the afternoon opening (200 only). If you having a camping reservation you can get in regardless of gate status.
I'm not sure. I would say call or go to their website
I would call them. They sometimes close on odd days, so they maybe open.
Yes they are open on Christmas Day. And they also have group walks that day
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