Could try Miltown Malbay on the way down reasonable to superb music on most nights
Tha Crane in Galway is usually worth a visit.
Really don't know about Cork - great county for musicians
There used to be a fairly reliable guide to sessions in Ireland - vant find it t resent but you might try this for Cork City
http://www.tripadvisor.co.uk/Travel-g186600-c4976/Cork:Ireland:Traditional.Irish.Music.Venues.html
or this
Always found Matt Molloy's a bit too Wall-to--wall for comfort
Jim Carroll