Guinness; potatoes; cabbage; lush green countryside; great music (harps and uillean pipes figure largely, but Scottish pipes are also played, along with the famous tin whistle, as well as the bohdran pronounced bohran - a hand-held drum) and musicians; George Bernard Shaw, John Field, and heaps of other Irish poets, composers and writers.
And pubs.
Also, going back a while, being fiercely territorial and warlike. Now they're quite tame, unless provoked. Much like the rest of the world, really.