Took my wife to Ireland for our 25th anniversary. What great history, wonderful people, beautiful scenery. We saw many of the old castles and cathedral complexes, went to Dublin, Galway, Kilkenny, and many of the small villages.
I took my wife to an abandoned cathedral, and recommited our vows. This really made for a great trip, and was a lot of fun, for both of us.
If you ever have a chance to go to Ireland, it's worth the trip. Rent a car, and make your own itinerary. Get out and see the sights, and meet the locals.