We enjoyed the Book of Kells and the whole Trinity College area. We got tickets in advance. We didn't plan far enough in advance to go to the Gaol - it was sold out like 2 or 3 weeks in advance. Just FYI. We went to EPIC the Emigration Museum and were underwhelmed. Next time I want to do the Post Office for Easter Rising history. Walking around was very fun too, interesting small shops and restaurants, etc.