Dublin's interesting and beautiful!
Dublin's been really great. There are so many locations you can visit. The food (especially the Dinner) is really expensive in Ireland and of course, in Dublin as well. You should always have lunch instead of Dinner ;) The public transportation system is sometimes a bit confusing. For tourists I'd recommend the Freedom Busticket. It's a bit pricey but you can use the Hop-on Hop-off Bus as well.
Insider Tip:I'd recommend a great pub, but than it was no longer a Insider Tip ;) Go and check out the Trinity College. I loved the library.