Guinness brewery tour, loads of good traditional pubs, Johnny Fox's pub or the Blue Light up in the Wicklow mountains.
Take a day trip to Glendalough, its only about 75 minutes from the city centre, and if you don't want to rent a car and drive, they have buses that will take you there from town. Well worth it, especially if the weather is nice.
Here's one bus service, there are a few others as well.
I was in Scotland last summer. We drove to St. Andrews and parked our car next to the golf course. We walked right up on the 18th tee box and wached people tee off, then we waited between groups and ran onto the course to get our picture on the Swilken Bridge. for me, this was a must. But with the tournament that may not be an option. We basically walked the length of the town. At the east side there is a large cemetary with cathedral ruins that are really pretty, and it's right on the ocean. We also walked on campus. fun place.
#1 in all of Dublin- Guinness Brewery Tour/Museum
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#2 Temple Bar/ ????? Head...
#3 Trinity College campus tour
I was there for a total of about 5 or 6 days in February after spending a week in the greater Drogheda/Slane Castle area. Dublin doesn't have a lot of "must see's". Experiencing the place is great, but the Temple Bar area is simply filled with assloads of "what I would imagine an Irish bar with 'traditional Irish music' to be" bars. HORRIBLE.
You basically want to get to the other side of the Trinity Campus from O'Connell Street. Back in there are where the decent bars and restaurants are. But the Guinness campus at "St. James' Gate" is Mecca. Pure and simple.
Other than that, any pub where you can knock down a few Guinness is nice. Also, try to find live non-"traditional" Irish music. It is a vibrant city with tons of creative people.
BTY, I write this wearing my "Trinity College Dublin 1592" ballcap. Give the city a wink for me.
Another hfans poster and I flew over for 48hrs last year just to party in Dublin (I caught a flight to Scotland after that and he hauled back to NYC).
It was f'ing awesome. Temple Bar street is an Irish version of Bourbon Street and the Temple Bar area is an Irish version of the French Quarter... or at least that's my take on it... I didn't go for the cultural experience (trust me-- I do that too, but it wasn't the point of that particular trip).
If you're single, Dublin rules… I mean, it rules either way... but it’s also very fun if you’re single. On the weekends it's full of bachelorette parties (Hen Parties as they like to call them).
I hooked up with a damn good looking 23-year old... for a while until her roommate walked in and yelled something about the chick's boyfriend (she told me she had broken up with him, whereas 3 hours prior he was just "out of the country" for work).
Anyway, if you're into that style of debauchery then Dublin is perfect.