Howya drummergirl - 2 weeks here is not bad at all ! Hopefully the weather improves by the time you travel - lousy at the moment.
For music and touristy things - you've already got a great start in Lahinch - really not much more can be added to your itinerary, maybe however a boat trip out to the Arran Isles or visits to Achill or Moher - pure scenery.... Galway city is not very far - (actually nowhere is very far - everywhere in Ireland is reachable in a few hours )- and has a great 'buzz'to it.Not bad for shops and drink too. Don't be afraid to get absolutely drunk at least one night whilst here - maybe you do or don't at home but at least once you must here...
I would love to say visit the North for some of the 'cultural' experience - but NO - 'tis definitely a no-go area for Irish reg. cars - watch the TV for news - it's the height of the 'marching' season there when you arrive - make up your own mind - but my advise is don't go.
On a more positive note - drive to Galway and get a bus to Dublin. Stay in a B+B, and return same way next day - great city with absolutely loads to see - maybe stay the weekend ?
Don't knock the tourist trap of Bunratty - fabulous place to see - yes it is a themed folk park - but still so good - book ahead to attend the banquet at night.
But simply - come with an open mind and don't expect much - you'll go away with your own individual memories no guide book can give you - enjoy and Failte
Diesel