This country is as amazing as everyone says, the countryside to the pubs, this is a charming place. The people are vibrant and genuine, I can not say enough good things regarding this place!
Fondest memory: My fondest memory of Ireland is the people. I had a unbelievable time there and it was at a time in my life when I needed something positive and good, and there it was....
A handy thing to pick up (depending on what you're planning to do) is the Dublin Pass which gives access to 30 of Dublin's top attractions and includes transfers to and from the airport!
A number of interesting sites (8) in Dublin (and lots more in the rest of the country) are run by the Heritage service of the Office of Public Works. Their web-site lists their sites and opening times and you can buy an annual Heritage card for all their sites at any of their venues (useful if you plan to visit more than 2 or 3!) or on the website.