This is my go-to rec to anyone visiting Dublin. It's a tour where you go on a pub crawl with two performers who tell you about Dublin's literary history through skits, anekdotes, street performances, and a quiz! (it's so fun even my non-literary friends I dragged along loved it)
I just spent 2 weeks in Ireland over christmas/new year's and most of it was at my family's home in Dingle. it's a magical place where many people still speak irish, and everywhere else we visited, people would say how jealous they were that we were visiting Dingle. it's a pretty small downtown area but I saw several pubs offering accommodation, everyone is so welcoming. specific recs include dick mack's pub, the fish box, and murphy's for ice cream.