I know this may be a little late for your trip, but in case anyone else has the same thought, I spend just over a week in Ireland, I arrived at Shannon Airport and then travelled North to Galway taking pictures all the way, then rode a horse from Clifden back to Galway, then back to Shannon and home. I was there in very early May - and apart from one day of rain - the weather was warm and sunny.
Points of note:-
Bunratty Castle, and Folk Park. Lovely castle; the folk park is worth a visit if you want to capture shots of "ye old" Irish shops including a working corn mill. It is a great recreation of rural Ireland of 100 years ago.
Heading more north - via Listoonvarna, there is an amazing landscape called "The Burren". It is a hugh area of limestone pavement, where glaciation, wind and rain erosion has formed deep crevices. The flaura tends to be small - hiding in these crevices, but there is quite a varierty of it; a mixture of alpine and mediteranean plants, including purple orchids. In the middle of the Burren you will find the "Poulnabrone Dolmen", an ancient tomb dating back to 2000BC. It consists of several upright slabs of rock - and an even bigger slab of rock for a roof.
I spent a few happy evenings climbing over the Burren near Ballyvaughan getting some sunset shots over the water.
Since the area is very rocky, the farmers fields have been bounded by stone walls, with the stones being taken from the fields. This means there lots of small fields and alot of old stone walls !
Also in the same area are the Cliffs of Moher - 200m high cliffs, where many sea birds nest.
The churchyard in Kilfenora has some lovely high crosses.
Doolin and Ballyvaughn are quaint villages. Doolin is well known for the folk music scene.
The scenery from Clifden to Galway is excellent, hilly rather than mountainous. It is similar to some areas of the West Coast of Scotland. Roundstone is lovely village where they make traditional Bodhran - the irish drum; and the coastal scenery excellent, some lovely sandy beaches, and rocky shore line.
I hope that your trip went well, and that anyone else planning a trip finds this useful.