I guess it depends on what age you are and what you have in mind as to what nightlife you will be looking for in Belfast City. The good news is that there is just about something for everyone. The only thing I know that you can’t do, well legally anyway is gambling. It is illegal to play poker for money in Belfast at the moment. There are also no known strip clubs.
There are however plenty of clubs, pubs, bars, restaurants and night clubs to chose from and just about something for everyone.
Below you will find a set of links that will inform you on whatever you are looking for.