It's small. It's full of tourists, and as such doesn't really feel alive. It closes up at 10pm. Some of the restaurants say they're open until 11, but walk in after 10 and you'll be told that the kitchen is closed, and out you go. I don't know what sort of bylaws Montreal has going, but if a China Town isn't even open until midnight (or say, 4am) I don't know what's going on.
Take a picture of the gate, and then be on your way. Maybe try the Dragon Beard's candy, just for a lark.