we have gone to the quality hotel , Killarney twice recently and stayed in a holiday home there. Nice house plenty space. I thought it was lively, kids clubs, nice pool etc, good restaurant. Very family friendly altogether. I would suggest booking through the hotel directly as it may be a better rate. Also book the restaurant while making the reservation as otherwise you will find that it will be full. ( most people on deals including dinner so spaces are reserved for that) There is also a great playground in Killarney which 10 year olds would still enjoy