lance,
I know the reply is a bit late, however I live in Northern Ireland. Their is a C&CC site just outside Downpatrick called Delamont, it's fantastic right on Strangford Lough loads for the kids to do as it's next to the country park with a massive play park,miniture railway and short/long walks which can be done on bike as well. As it's no too far from the border it would be an ideal stop on the way up to the north coast, the showers are spot on as well. Up at the nortyh coast there are some lovely sites. Try Bush caravan park it's got an on site park, not many showers but are kept spotless. Also try Ballymcrae caravan site, it's small(about 45 pitches) very friendly a bit of a play area for the kids, the showers are a bit dated but kept clean. Its also a five minute drive to the beach from there. But also try the other ones recommended they are very good.