IRELAND Sep 1-5 Best to Explore

Hi everyone...

My wife and I are arrive Dublin Airport Sat. Sep 1 5:30 am and leaving Wed. Sep 5 1:30 pm.

Such a short stop, but we would like to explore the countryside. We could stay in Dublin one night (or two) before our flight back, but we want to get out into the countryside more rather than be around the city life (we can do that on future trips).

We'd like to see the nature of Ireland - cliffs, a castle or two, etc. It's no trouble for me to drive but I'm open to any options. Plane, Dart, Train, or combinations. We're even okay with getting up early on Wednesday for a drive or train back to the airport from Galway, Clare or some other location.

Appreciate any input!