I work retail and in anticipation for the holiday lockdown period (20th-31st of December), I'm taking the 17th-19th of December off in order to get a little me-time. I originally just considered getting a small airbnb cabin near Traverse City (I live in Detroit and could drive) and enjoying some peace and quiet, maybe going into town, but I wanted to think of something more ambitious.

I was wondering where my absolute best options might be to travel somewhere in or even outside but near the US for 3-4 days (possibly departing the evening of the 16th and arriving back late on the 19th or very early on the 20th, either by plane or car), solo, and in mid December. I figured one of the national parks out west would be cool, like Zion or something, but the one thing that I've wanted to see the longest are some real mountains, like something part of the Rockies. I just don't know what the feasibility or the intelligence between doing a trip like that this time of year would be, and wonder if I should save it for next spring/summer instead.

I want to maximize my itinerary since its such a short period of time but also not go broke doing it either, and I'm curious about the logistics when it comes to car rentals or anything like that (I'm 24 if it matters).

TLDR basically, what would the best national parks to visit be in mid December (mountains ever so slightly preferred but I'm open to all of it).