The Beara peninsula is breathtaking but ground clearance could be an issue at times. We found 'significant' grass growing in the centre of the narrow roads in a number of places.
The country of 40 shades of green is also known, as you'd expect, for a bit of precipitation now and again. We were in the Jeep - just as well, as we drove through a foot deep flood for a couple of hundred yards!
I don't know what your accommodation plans are but we found B&Bs to be warmly welcoming, characterful, excellent value, comfortable and generally very high spec. We used a Sawday's Special Places to Stay (Ireland) guide. I know though that many excellent B&Bs choose not to subscribe to Sawday's!
We were only in the south (of Dublin) and I was sorry to miss New Grange. It will be on my list next time.