The southeast of Ireland generally does have the mildest weather of the whole island at almost any time of the year. However, from a golf course perspective, that part of Ireland probably has the weakest collection of courses. In the southwest, you have Lahinch, Ballybunnion, Waterville, Tralee, Doonbeg, Killarney, etc. In the northwest, there is Rosses Point, Connemara, Belmullet (Carne), Donegal, Cruit Island, Ballyliffin, etc. In the northeast, the leading courses include Portstewart, Portrush, Castlerock, County Down and Ardglass. The Dublin area has Portmarnock, Little Island and County Louth. While I am sure you can find very enjoyable golf in counties Wicklow, Wexford and Waterford, you will not find the best of Irish links golf there (aside from the European Club in Brittas Bay) . On the other hand, it is hard not to have a great time in any part of Ireland, so go and enjoy yourself!