If you approach Ballycastle from Cushendall you will arrive in the village at a red sandstone bridge which is part of a T junction, having past Bonamargy Friary on the left and Ballycastle Golf Club on the right. Turn left for the Glenshesk Scenic Drive and right for the Causeway Coastal Route,both are signposted.
The Glenshesk Scenic Drive morphs into the Glentaisie Scenic Drive before arriving back in Ballycastle. The route takes you through Glenshesk, around the back of Knocklayd mountain and past ancient Breen Wood to St Patrick's Church and the Round Tower. Just before you get to the church you will see a sign saying 'Scenic Route' pointing you along the Lagge Road, this is the road which morphs with the Glentaisie Scenic Drive. If you want to see the Round Tower, Armoy and the Dark Hedges ignore this and go straight on. I dont know why Armoy is not officially on the Causeway Coastal Route....it does not make sense in my opinion as it is the gateway village to the two glens and also the nearest village to the Dark Hedges. It is also where the Armoy Armada honed their road racing skills and where the world champion road racer Joey Dunlop spent a great deal of his time.
If you do opt to go to Armoy, on the way back follow the main road to Ballycastle for about 3 km, you will then see a sign on the left hand side which points to Glentaisie. This will take you back into Ballycastle via the Glentaisie Scenic Drive....its a narrow road in places so drive with caution but you will be rewarded with a glimpse of rural scenery and life along with some excellent views. If your coming from Ballintoy follow the Causeway Coastal Route signs to Ballycastle seafront and then look out for the Glenshesk Scenic Drive. There are also lots of smaller rural roads to explore if your adventurous including one the runs along the side of Knocklayd overlooking the glen.
Taking this drive and allowing yourself time to take in some of the highlights - Round Tower, Dark Hedges and Armoy village will take two to three hours. Also if your interested in Horse Trekking and Heritage check out Sheans Horse Farm, an excellent day out with lots of things to see including the story of the battle between the McDonnell's, O'Neill's and McQuillens. The centre is a few miles along the road to Loughgeil from St Patricks Church and Round Tower.