I've just got my bike so havn't been up the coast road in anything other than the car - but can't wait to get out on a good day
The coastal route actually starts from the town i live in, Larne and u then head up north to Portrush/portstewart and beyond. The coast road itself is about 60 miles of winding pleasure and there are a few offshoots that'll be a great ride. Hopefully someone who's done it a few times will post with some road names and more specifics =]