Best National Park to visit during Christmas season.

Hello, I’m having family issues and want to get away for Christmas holiday. I’m off work 24-26, any National Park recommendations? Hopefully with pretty sights & less people, I’m near Vegas.

Merry Christmas & happy holidays to everyone! Thanks in advance!

Edit: I’m bringing my pittie with me, I have a rooftop tent on my car that’s insulated. It’s not weather rated for whatever reason but reviews/feedback have suggested doing well at low 20s temperatures with layering.