I don't quite remember how late those passages stay open.
I'm pretty sure there is a way to walk through by a far end of the train station. I'd definitely agree that the nightlife on the west side isn't good (in fact, I've never bothered with it!).

Sorry I can't be more helpful with this, but I'm almost certain there's (at least) one there. Worse comes to worse, you can check it out when you first get there.