2. Hurling

3. Guinness
4. Irish Whiskey
5. Cliff's of Moher (and other amazing sea cliffs)

6. Irish monasticism/Celtic spirituality

7. Galway (which was home for a Summer)
8. Dublin (it would still be a great town, even if it didn't produce u2 and Guinness)
9. The Committments.

10. More u2 (worth mentioning twice!)
I'll second the Guinness and whiskey :)
and Van Morrison, and the Pogues, and Harp