"Dw i'n mynd i'r dafarn am hanner dydd."

Translation: I am going to the pub at midday.

[Esse-Honorem]

What difference is there between a pub, a bar and a tavern?

[EllisVaughan]

Pubs and taverns are pretty much the same thing. Bars are more likely to be found in cities and are more open plan with people standing. For this sentence I think that pub or tavern would be an acceptable answer