Flying in to Dublin stay couple of nights. Then going to Galway to stay. Will be visiting sounding areas.
I've made this trip twice. Once flew to Shannon and toured the west and south. You'll probably find this much more interesting. The other time was for a wedding outside of Dundalk, up near Ulster. That time I flew in and out of Dublin. I spent a week mostly in mountains of the southeast.
Both were long ago and in the days of film. I took my EOS-3 and a bunch of lenses the first time. Mostly they took up space. The second time I took my old 28-70mm f/2.8 L and a 24mm f/2.8 (old version of course). I made some great images during those trips but not many were indoors, aside from a few at my friend's wedding (I wasn't the bride's family's paid photographer, just a guest). That's my point though. Ireland is great for the (mainly outdoor) scenery and the people and pubs. If I were going today, I'd probably take my 6D, my 17-40 f/4, my tripod, and maybe nothing else.
If you're basing yourself around Galway, try to get south to Dingle. It's gorgeous and there are lots of great locations on the peninsula. On the way from there to Galway we found a castle that had not really been restored. Just a sign in front and it was open. It was near the water and it was quiet and had an eerie feel. I could almost hear Cromwell and his men coming...