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?
When I was an 18 year old high schooler, we would go to our towns bowling alley that did last call for a game at midnight. We would also go to a hookah lounge, which was open until 2am. YMMV with these, but they worked for me about 6 or 7 years ago.