We really enjoyed Dublin. There are beautiful, massive churches on every corner! The Kilmainham jail was a great little tour. The hop on, hop off bus is a good investment if you only have a couple of days. Also the charity shops (not the vintage shops) have great deals and there are a lot of them. We enjoyed the traditional music in the pubs. I would definitely return.
Insider Tip:Go to Gogurty's! It is right next to the famous Temple Bar, but when Temple Bar was playing outdated American rock songs, Gogurty's had a two man band playing traditional Irish folk music. The music was incredible and we danced all night long!