Well, I'm somewhat envious of your original location but, oh well.
I agree that you should have no problems with the natives here as we are transplants from WV about 1 1/2 years ago. It's funny in a way; I'd say 75% of the people I come into contact with are from somewhere else, not Raleigh (or even NC.)
Your outdoor activities can be fullfilled here as well: plenty of lakes, the Smokies are about 3 hours west and the beach is about 2 hours east, and Raleigh has an excellent parks system. Plenty of things to do.
I do know there are Irish groups and organizations here and I did a quick search and found
http://www.irisheventsnc.com/. Take a look as it may have some info for you. The bar listed at the bottom (Tir Na Nog) is the one my wife and I like to visit when the kids push us over the edge. Good live music there. Hey, bring me an irish coin so I can use it as a ball mark! Just kidding. Good luck to you.