The District is the place to be at night. There’s a real night club where you can dance until the early hours, Evolution, on the one side and several bars like Pink, Skyline and 687 on the other side.
Also bars at other places stay open at night like Cove Café, Bon Voyage and Vista Café. You can find more information about all the bars here. Besides that you can also go watch a movie in the Buena Vista Theatre.