The other way to see this coastline is by train. We all took a ride from Coleraine to Derry and back and it's a fantastic run. The train goes North from Coleraine following the river Bann, and then turns westwards following the sea, it dives through tunnels, emerges under great cliffs, skims through dunes, and under mountains and provides a completely different view of the land from that from the nearby the main road.
Northern Ireland railways has bought some fancy new trains too. Here's one of their old trains still used on the Portrush branch, reflected in the window of a new one, bound for L'Derry.