Hmmm, Bass in saltwater, trout, salmon & sea runs in the rivers & lakes - the words International Clave spring to mind! It's been several years since I made the pilgrimage to the Emerald Isle and it would be grand to get back there.
Striblue, you may want to include Enniscoe House in Crossmolina Co. Mayo in your itinerary. In addition to a fine country house steeped in history, they run a Family History center for folks like your wife to trace their ancestry. The fact that it stands on the shores of Lough Conn is incidental of course!