Re #22 and #23 - as Barney suggests, rail travel is rarely going to be much quicker than road in Ireland. However, there are reasonable train services from Ennis, Tralee, Killarney, Cork and Waterford to Dublin.
These days almost all Irish pubs offer a very wide range of drinks. Whiskey (being an Irish invention...) is available everywhere, though it's pretty unusual to mix it with Coke in Ireland - more commonly with lemonade. Cider is very widely available (though the quality is pretty dire), and a wide range of spirits as well as a smaller range of generally mediocre wines is available in pretty much every pub. As well as alcopops, if your friends want to stick to the fruity flavours! So your beer-adverse friends shouldn't have any difficulty.
