Grafton Street is one of two pedestrian shopping avenues in central Dublin (along with Henry Street). It runs from the northwest corner of Saint Stephen's Green to the west side of Trinity College. Though Henry Street receives more visitors, Grafton Street has more upscale retailers. This is one of the most expensive commercial streets in the world.
Street performers, called buskers, ply their craft here on weekends. There are mimes, singers, magicians, and people in costumes. Several famous musicians got their start here, including Damien Rice. Even if you don't need to buy anything, the atmosphere and entertainment make a visit worthwhile.
If you are into shopping, this is the best place in Ireland to do it. All the standard clothing retailers are here, including H&M, but there are also lots of unique boutiques. Weir and Sons is Ireland's finest jeweler, and Brown Thomas, Ireland's finest department store. Some of Dublin's best restaurants are also located here.