Carlingford - less than 1 hour from dublin.
there is a 4seasons hotel with swimming pool - not sure what size.
lovely little village with loads of pubs. http://www.carlingford.ie/
Lovely bar and some of the best bar food I've had...i would actually say their bar food was better than their restaurant. Nice clean hotel, lovely rooms etc.
Definitely worth it if you can get a good rate.