Not far out from Killarney (about 5 miles) along the N22 is Kennedy's Animal, Bird and Pet Farm. We spent an afternoon there with the girls playing on the outdoor and indoor playgrounds, petting animals and having fun.
Kennedy's has dozens of animals: sheep and goats, horses and deer, puppies and rabbits, all sorts of fowl from chickens to peacocks and so many more. Most are friendly and will gladly follow you around if you give them a scratch on the nose (as we found with the deer- they were our constant companions during our time at the farm).
Kennedy's has a large outdoor play area with swings, slides and forts, a huge indoor area with a maze, sand pit, riding toys, swings and slides and a toddler play area (also indoors). There are buses that have been converted to seating areas and a few restrooms scatted throughout the property.
This was definitely a welcomed break for the girls from the castles and abbeys we had been touring.
Although we didn't lodge there Kennedy's has three self catering holiday homes for weekly rental. With a view of the mountains and accessibility to the animals and playground this would definitely qualify as a children's paradise.