yeh went to this a few years back.
Castlewellan is a lovely village about 20 minutes from Newry city. All in, its about an hour and a half from Dublin.
A lot of watercooled stuff i'm sure, but i'd say there will be aircooled too.
You're only 10 minutes from the spectacular Tollymore forest parl in Bryanstown. This is where they filmed "Game of thrones" with Sean Bean.
This is The stepping Stones in Tollymore, you can pay in for the day if you want, or you can camp overnight but i would say it's probably booked up already.....