not sure how long it would be to Galwat from Dublin,only over familiar with the Cork to clare route.
loads to do up there but mainly relax and do nothing,lovely beach in Lahinch and another in Fanore,golf ,horseriding,cliffs of moher ,for the kids moher hill farm pet farm. walking ,the Burren,drinking,Doolin is lovely and you can go over to the Aran islands from there as well,fishing ,bring the bike if u have one and Ailwee caves worth a look once but i wouln't be going every time i went there,although my aunt works there so i kinda have to to go see her.i also recommend the rock shop in/near Liscannor .
if you drive from lisdoon over to lahinch there is plenty to see really and the scenery is fab if the weather is good