Smithfield’s biggest draw is devoted to uisce beatha (ish-kuh ba-ha, ‘the water of life’); that's Irish for whiskey. To its more serious devotees, that is precisely what whiskey is, although they may be put off by the slickness of the museum (occupying part of the old distillery that stopped production in 1971), which shepherds visitors through a compulsory tour of the re-created factory (the tasting at the end is a lot of fun) and into the ubiquitous gift shop.
If you're buying whiskey, go for the stuff you can't buy at home, such as the excellent Red Breast or the superexclusive Midleton, a very limited reserve that is appropriately expensive.