If you have any interest in contemporary art you have to visit the Douglas Hyde gallery when you're in Dublin. It's not commercial and has without a doubt the best exhibitions (and lecture series) of any art institution in the city. It's a strange deep box space which must be difficult to install work in, but often makes for interesting shows. It's right in Trinity college, so will probably be on your tourist trail.

Trinity College, Nassau Street entrance

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Cheaper than London Eye with possibly better views. It's more historical, in a nicer part of town, with no crowds - and you get a bit of a workout climbing to the top.

Monument tube station

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