I'm going to Dublin to present at a conference in June and I'm sticking around for four days after the conference to play tourist. Obviously I'm hitting touristy stuff (Book of Kells, National Museums, Guinness/Jamesons, Dublin Castle, etc.) But are there some less obvious places I should visit/things I should see? I'll be pretty dependent on public transportation so easy to get to is important. Or is there a good day trip I should check into? And any recommendations for places to eat?