Some of the key sites we saw in Dublin include the Guinness Storehouse, which was a fairly fantastic place. As expected, it walks the tourist through the stages of making Guinness. There is a taste-test room where you can get a shot of Guinness (I skipped the shot), and then there is a rooftop bar filled with tourists drinking the brew. From the 360 degree room of the bar, you can see just about every little bit of Dublin and then some beyond.
We also saw the Book of Kells at Trinity College, St. Patrick’s Cathedral, and Christ Church. Christ Church has a huge collection of loot in the basement (crypt), which was fairly impressive. They were worth the entry fees.
One day we took the DART (which is the mass transit train system) up and down the coast in the suburbs of Dublin and the smaller surrounding areas. We saw several castles, including Malahide castle. There were tons of cafes along the way where we warmed up with tea and snacks.