You MUST visit West Cork :
As well as The Gurranes near Castletownsend already mentioned, this is a must with stunning views.
http://www.megalithic.co.uk/article.php?sid=85
Also you really have to visit the four West Cork peninsulas. They are spectacular. Beara as already mentioned is a must, but you really should treat yourselves to all of them .
http://homepage.eircom.net/~jearley/beara.htm
Also, check out Bantry ( wonderful Bay, vibes and food ), and for great sounds, the internationally renowned De Barras in Clonakilty. If you're lucky, you may bump into Roy Harper as well !
If you can, get one of the many boat trips out to the islands ie. Sherkin Island from Baltimore as well.
Congratulations to you both, and have a wonderful time!