Easiest way up from Dublin ,M1 to border,A1 to Sprucefield,M1 to Belfast,Westlink through Belfast to M2 (roadworks so possibly slight delay though not bad at weekends ),M2 until junction for Ballymena then Ballymena ,Ballymoney,Portrush,as you enter Portrush go right at the first roundabout and try to get to the top of the cliffs at Ramore Head to the east of the bay,best viewing spot.Motorway dual-carriageway most of the way easy drive.Should take you around 3 1/2 hrs.A lot easier drive than me going to Salthill.