For me, it has to be the road coming out of Glengarrif heading for Castledownbere, the sea views there are spectacular and it's a decent road alsoC'mere, what's your favourite road in Cork?
For driving, I'd go for the M8 between Mitchelstown and Fermoy before you get to the toll. It's usually a nice quiet stretch, mostly straight, nice views. Fermoy bypass is also nice but the toll is a bummer.