Spent three weeks there in September - circumnavigated the whole country
Dublin is great - visit Temple Bar for the bars and atmosphere - lots of good sights and restaurants. Between the get-on/get off siteseeing buses, the local tram and the DART, an easy city to get around. Waaaay friendly.
Be sure to go to the south and west - Kinsale on the south coast and Dingle on the Dingle Pensinsula should not be missed. Especially Dingle - 3000 people and 15 pubs. Go to John Benny Moriarty's for great food and live music. In Galway go to the Latin Quarter - a 17th century pedestrian precinct filled with more good food and music - try Nectain's Bar.
And Kilkenny - great little city in the middle of the south. But I wouldn't bother with Derry (Londonderry for the British) again.
Don't be afraid to drive in Ireland - except Dublin - light traffic with good manners. The west has sensational motorcycle roads, but I would save them for a later trip as April might be wet, and there's that whole "driving on the left" thing - easier to remember when you have a steering wheel to look at. Don't use a cell phone while driving - automatic 1000 euro fine.
All in all, a wonderful and friendly country to visit - just like Canada !
And Guiness is not the best Irish beer - Murphy's is !!!!

Have a fabulous trip,
Pedro
