Avoid Irish pubs on St. Patrick's Day. They're totally crowded with *very* drunk people aspiring to be "Irish." People from Ireland frequently don't understand the North Amercian celebrations. Back home, the traditional outstanding feature of St. Patty's Day was that you got to go to mass twice...
(But if you must, Dora Keogh's, P.J. O'Brien's, McVeighs or Allen's...thought it's not technically "Irish.")