Bars are notable for staying open late, but I’m not really familiar with alternatives that might operate similarly. I think many cafés (at least around my area) tend to close a few hours earlier by comparison, which would be my go-to for an alternative otherwise, so what other options are there?
Several of my friends in my mid 20s didn’t drink, so we usually would hang out at hookah bars. They are great, especially if they are allowed to serve food where you live. Most at least serve tea and other non-alcoholic beverages. I can give you a few pointers for first-timers if you are interested.