If the weather's nice, take time for a stroll around the park in Stephen's Green. From there, take a walk down Grafton Street - top shopping and there are several famous pubs on the small streets off to both sides. Powerscourt Townhouse is an interesting shopping area halfway down on the left, where an outside square has been glazed over, with shops and cafes in the converted houses all around and in the middle. It's along a laneway, so you might need to ask where it is. At the bottom of the street, if you walk through the grounds in Trinity College, you forget that you are in the city. From there, you are close to Temple Bar.
At night, one place you could try is The Arlington Hotel on Bachelor's Walk for a cracking show of Irish music and dancing. If you are into bands like The Wolfe Tones/The Dubliners, you will find suchlike at Whelan's on Wexford Street, though don't go if you are sensitive to rebel songs. For a more lively time, the Cafe En Seine on Dawson Street is totally jumping.
I'd pass on the Guinness tour - it's not a patch on others like the Benedictine one.
The Arlington Hotel! Couldn't remember the name of it before, we had a cracking night there, dinner and a show downstairs, dj afterwards upstairs.
Touristy stuff but great fun, I seem to recall being invited on stage to join the Irish dancing at one point,
The food was nice to say it wasn't expensive too, but if you want to go you have to pre book it.
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