I did a guide for a mate visiting a while ago, so Im gonna be lazy and cut and paste the contents of that email;
Pubs
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Id recommend the following (not in any particular order)
The Garrick - good fun and a decent bottle range with some interesting specials
The Spaniard - tiny (smaller than the small Ron Blacks on Dawson st) - not a great selection of cask ale tho!
Duke of York - old school style pub with lots of young ones - upstairs is the Belfast equivalent of SlapperFaces (in terms of ease of scoring)
Downstairs is fine for a beer and a bit of craic
John Hewitt - nice bar with Kolstryker on tap!
Kellys Cellar - really retro decor (like 1940s!!!)
The Crown - full of tourists, and generally not impressed by the barstaff - they do have cask ale tho!
Laverys - central bar nice and handy
The Botanic Inn - studenty
The House - bit poncy (think coctail bar) but not on the same level as Ron Blacks or Cafe InSane
The Kitchen - newly redecorated - nice enough
Whites Tavern - nice place for a quiet pint and a chat
The Morning Star - good pubgrub but a bit pricy
Avoid the Bridge House, Benedicts, and the Beaten Docket (all dodgy), Cafe Vaudiville (unless you like talking indeterminably about how you bought your Porche 944 cos that was the one that you actually wanted, and you didnt really want a 911, and Jeremy Clarksons a tosser, and....) and under no circumstances go into the Royal bar (massively loyalist)
Food
Generally you'll be shocked by the price and the quality (in comparison to Dublin)
Tao Noodle - good grub in the centre of town for less than a tenner!!
Laverys - pub grub - nothing fancy but plenty of it
Villa Italia - Really good - go here if you like Italian
Gingerroot - good oriental food
Mollys Yard - foods grand, but I mostly went here for the beer on tap!