If you have no idea where to begin your night out in Cork city, then you could do a lot worse then beginning with the Oliver Plunkett on Oliver Plunkett Street. It is a spacious bar which will provide you with the usual bar service, cocktails and food. Service is fine, just make sure they know you exist and you will be looked after.
If you get tired of the Oliver Plunkett, don't worry, there are plenty more hosteries in the immediate vicinity such as;
The Glandore Bar
The Old oak
The Long Valley
Souths (in the Imperial Hotel)