How realistic is it to drive to the above with 2-3 days to spend
Hi Stephanie, greetings from Ireland.
If you have two days then you've no chance, but in 3 you might.
Castlegregory is close to Dingle and Bandon is not a million miles away from Kinsale, so you can think of those two towns as your landmarks.
Leaving Dublin you'd be in Castlegregory in about 5 hours approx. From there to Bandon the next day would be around 3/4 hours.
You obviously have important reasons for going to both as otheriwse thats a pretty random itinerary and you would probably be the first tourist in history who's itinerary was specifically - Dublin to Castlegregory to Bandon! :)
Le meas/with respect
Stephen McPhilemy
Rick Steves ireland Tour-Guide
Dingle and Derry