There is a lot to see in Dublin, and we should have allowed more time in this place. The light rail system has a stop within 5 minutes walking distance of where we disembarked from our ship.
We took an 'off and on' bus tour of the city. Our favorite experience - a tour - was of an old jail - the Kilmainham Gaol (Irish: Príosún Chill Mhaighnean), built in 1796; now a museum. It has been run since the mid-1980s by the Office of Public Works (OPW), an Irish government agency. Kilmainham Gaol played an important part in Irish history, as many leaders of Irish rebellions were imprisoned and some executed in the prison by the British and in 1923 by the Irish Free State Irish history was for us - and important focus in this tour.
We stayed in a hotel in Temple Bar on Fleet Street -- "Fleet Street Hotel." The breakfast at the hotel was a very complete and good one.
The Temple Bar area was invigorating, young, and full of Irish history. I suspect people were out into the wee hours of the night (on a Thursday!) but we went to bed. We enjoyed a great Irish dinner at a pub - and enjoyed true Irish musicians/singers. This area is worth second, third, and beyond visits.