Here is my tentative itinerary, is it too ambitious?
Day 1 – Fly into Dublin early AM, some sightseeing, overnight
Day 2 – Drive to Dingle, overnight
Day 3 – Drive to Galway, visit Cliffs of Moher enroute, overnight Galway
Day 4 – sightsee all day, overnight Galway
Day 5 – early AM flight out of Shannon
My alternate itinerary would exclude Dingle