Long weekend solo trip during summer within ~5 hours flight of San Francisco, where to go?

I have a bunch of PTO saved up but not enough time in my schedule over the next few months for doing a long trip, so I want to do one or two ~4 day trips taking a thurs+fri off and go somewhere . Any weekend over the next 3 months except Jul 4 so far is clear.

Interests: I mainly like to do urban exploration, eat some good food, go to cool bars, meet some fun people. Recently went to NYC for work, stayed the weekend and had a blast. I’ve noticed that in SF people tend to stick with their friend groups and not really interact with strangers as much on nights out, so I’d definitely like to go somewhere where people are willing to do that.

Budget: $200 a day, but flexible on that

Some places I’ve already been: Mexico City, Austin, Seattle, NYC, and going to Denver in a month, so my preference is for cities other than those.

Looking for advice on where to go, what to do there, and good hostels where it’s easy to meet people!

Long weekend solo trip during summer within ~5 hours flight of San Francisco, where to go?