Here’s something you should definitely do if you’re going somewhere: double-check to make sure that it’s open.
Now, I know what you’re thinking: “Of course I do that. I’m not a moron.”
Though I think the Keelung night market is a compelling enough reason to visit Keelung on its own (the fact that it’s so easy to get here from Taipei makes this a no-brainer), you might want to do some other stuff while you’re here. I mean, you’re here already, you may as well.
Or you could just eat. That works too.
But if you want to walk off some of that food, there are a few interesting things around the city that you could check out.