I'm going to the UK for a couple of weeks in March with some friends, and we'll be spending 3 days in Ireland. I know it's not much time, but does anyone have suggestions of "must-see" sights? We're coming from London and will be leaving From Dublin early on the fourth day. Thanks!
Is one day and one night in Dublin enough for you? Will you be renting a car? If so, do you want to focus on the countryside around Dublin? Or do you want to fly to Cork or Shannon and pick up a car at either of those airports so you can see a little of the Southwest coast before driving to Dublin? (The latter scenario would be pretty rushed.)
This obviously depends on what you're into, so if you give us more info we can be more helpful.
If you're into history, the Book of Kells at Trinity College can't be beat. This is the gorgeous illustrated edition of the Gospels hand copied by Irish monks around the 8th Century.
For modern history, check Kilmainhaim Gaol, the jail where rebels were held in the years leading up to Irish independence.
For traditional Irish music, the Cornerstone has good sessions.
Obviously, having a pint in a pub is a great way to soak in Ireland. I'd stay away from Temple Bar. It's touristy and a ripoff. Pubs in other areas throughout the city will get you just as drunk (if that's what you're after) but have a lot more Irish charm to them. I enjoyed Brazen Head and Stag's Head, but everyone has their favorites.
Enjoy your trip!
Outside of Dublin, you can take a day trip to Glendalough or the Boyne Valley from the central bus station using Bus Eirenn. They are both great trips but you will want to spend a lot of time in Dublin too.
Literary or Music pub crawls are a good use of time in the evening.