Dublin is the capital and the largest city of Ireland.
It's a multicultural city. Walking by the streets, you can hear people speaking french, german, spanish, italian, hindi and other asian languages, and even, sometimes, a little bit of english.
The city center is relatively small and very active, full of students and young people. It's always funny and interesting to spare some time strolling and enjoying the city life. Think that, if you get tired, you can always get into a pub and hear some great live music while having a beer. You have never had a beer until you have a Guinness in a real irish pub.