Where can I go on a solo road trip in California? (Southern)

So, I am about to finish a job where I worked 12 hour days for 14 consecutive days and I am exhausted and in need of a break/getaway.

I’m located in Southern California and have a desire to road trip somewhere for a couple days by myself to decompress. I’m willing to drive ~3-5 hours. I’m hoping for some suggestions on a good place to travel.

I work weekends so it would be sometime during the week and I am *considering* bringing my dog along but that’s a very big MAYBE so the recommendations don’t need to include her.

I’m really open but ideally looking for someplace quiet and relaxing. Either a national park, small quaint town, etc. Open to a place with some sort of night life as I am 21 but not looking to go to a big city. Don’t know if such a place exists! No budget but ideally nothing craaaazy expensive.

Any and all suggestions welcome!!!

Where can I go on a solo road trip in California? (Southern)