Sadly most caravan sites in Ireland (NI and ROI) are not up to the standards of good GB sites in terms of facilities however one I would like to recommend is Rushin House Caravan Park just outside of the villiage of Belcoo on the Co Fermanagh (NI) Cavan (ROI) border. This is a small touring site on the shores of a lake with fully serviced pitches and with good toilet/shower/camping kitchen facilities. Only fault would be a lack of space for awnings as the concrete pitches are so wide that grass space between them is minimal. This is one of very few sites on the island of Ireland that has clean, modern and heated toilet/shower facilities. It is also in a great place for a stop over for anyone heading from Scotland, across N.Ireland to tour the west coast of the ROI. Fermanagh is itself a great destination with loads to do and lovely countryside.
http://www.rushinhousecaravanpark.com/
http://www.rushinhousecaravanpark.com/