My wife and I went to Ireland a couple of years ago to attend the wedding of one her colleagues. Schedules were quite busy at that time so we weren't able to see as much of the country as we would have liked. We spent most of our time in and around Galway, where the wedding was being held, and managed to fit in a couple of day trips.
The photo below is of the Cliffs of Moher, which is one truly awesome site. To get some perspective of how high the cliffs are look closely and you will see people walking the trail along the cliffs; they look very, very small. Only then can you get a true sense their scale. The highest point is over 700 feet above the Atlantic Ocean, and they stretch for 5 miles.
We also had a brief stop at Dunguaire Castle. As you can see the weather was cooperating quite well as I was given to understand that blue skies and sun can be rare in Ireland.
This last photo is on the island of Inis Mór (the big island), part of the Aran Islands. We took one of the later ferry boats out to the island. The downside of that is we didn’t have as much time as we would have liked before we had to catch the last ferry back. However, we did walk for little while to take in the unique landscape and spectacular views.
If you have never been then put this on your list; Ireland is definitely worth a visit. We were there for only a few days, but and would love to go back and spend some more time touring from county to county.