Colaiste na bhFiann
Colaiste na bhFiann is a gaeltacht that pops up a lot when you google where to go! There is 4 locations for Colaiste na bhFiann - Raithcairn, Drumree (5 mins from Ratoath!) Sligo and Cill Airne in Kerry. Although I don't know anyone whos ever been, some of the reviews are wonderful! All courses are 3 weeks long. Cursa A and B are open to everyone in secondary school, but Cursa C is only open to those in senior cycle.
http://www.colaistenabhfiann.ie/index.php?page=home