You would get a train from Dublin (Connolly train station) to Belfast (Great Victoria Sreeet train station, by Europa Hotel), then take a train to Coleraine, then from there take a bus to Bushmills (the place where the Irish whiskey distiller is), the Giants Causway is only a mile or 2 from Bushmills.
Translink is the local company in NI responsible for public transport, on this site you will find times etc for trains, busses etc, from Belfast->Coleraine->Bushmills->Giants Causeway.
Cob lives near there, he may be able to give you more info than I have.
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