Hello from Wisconsin,
Dingle is a rugged beautiful place. Quite full of tourists although September may find it less packed.
Instead of Dingle you might consider County Clare. It too is filled with beauty and being a bit bigger has more room for people. The coastal road is nice and there is a north-south road that is great. A short distance west of Killinaboy a road branches off to the north. It soon has a sharp S curve. go north on this road 7 km. Then turn left , then turn right and head for Poulnabrone Dolman. Continue up to Ballyvaughan from there. There is a lot to see along the drive and it is more 'old' Ireland than most. The Irish Tiger years brought a lot of home building. Somehow a good portion of this road missed the Tiger. Clare gets you closer to Dublin. For whence you may launch yourself for the city.
Another thought. Fly into to Dublin and rent a car and tour the Boyne River Valley, Hill of Tara, drop south of Dublin and visit the Wicklow Mountains (not snow capped by any means) and St. Kevins's Church. Rent at the airport and avoid driving in Dublin.
The less you drive the more you will enjoy your visit. Get out of the car as often as you can make the excuse to do so.
wayne iNWI