Visiting Ireland Quick Guide:
Currency: Euro
Major Airports: Dublin, Shannon, Cork and Belfast
Power outlets: Electric supply in Ireland is 230v and uses the three pronged formation as plugs in the United Kingdom. Instead of worrying about the right plug, get a universal travel charger here.
Language: The main language in Ireland is English but there are small pockets throughout the country where Gaelic remains the predominant language (known as the gaeltacht regions)
Major cities in Ireland: Dublin, Kilkenny, Waterford, Wexford, Cork, Galway, Killarney and Limerick
Ireland has the most beautiful weather in summer, during June, July and August. The days are long (daylight can linger past midnight) but of course, crowds are everywhere.
I personally try to avoid spending the summer in Europe during peak periods and prefer the shoulder season, in spring and fall.
We visited Ireland in October. On the plus side, everything is cheaper from airfare to hotels to car rentals. We snagged an amazing flight deal from Aer Lingus for just over $400 roundtrip. On the flip side, the weather alternated between beautiful and miserable and we were in the country when Hurricane Ophelia made a pit stop.