well jealous
love NI and the Antrim coast road is a must - but if you from NI then you know that already
have you done the Larne to Ballymena road? (A36, Shanes Hill Road) its a lovely twisty climb up towards the big B'mena roundabout - up or down, both great! cant suggest any roads to the south as I lived in Portrush and had a rather anti irish BF at the time and the only advise, from what I've heard, is watch for the dosey drivers..
the road from Ballymoney to Portrush is a long straight lovely road - easy to open it up - becareful, the police sit just out of view on the rise into Ballybogey.
have a great time!