As Hollydolly rightly stated N.Ireland (part of the UK) and the Republic of Ireland are quite different countries. I went to university in Belfast 50 years ago, but I grew to dislike the country intensely and I still don't want to go back. My daughter has to go there occasionally on business, but doesn't like it either. Reginald Maudling, the secretary of state on returning from Belfast once famously said, "For God's sake, bring me a large Scotch. What a bloody awful country."
A church minister, gave a rather more measured response, saying that there was nothing wrong with the country, it was only the people who spoiled it. Somewhat ironically, the Republic is becoming more liberal than the north, which is some respects, one of the most backward European countries.
Like a lot of places, as a tourist, you see a different side of things to those who live there. There is no doubt that it has great beauty, history, a great deal to see and world class golf courses. So, go there and enjoy yourself.