Jo,
Lovely site, can't remember if the actual site has a play area, just outside the gate you are in a huge country park and there is a big play are in there, and loads of room for running around and playing ball as well as a ski slope and taboggan run. I would say definately take bikes you can ride in the country park or you can drive along to burry port and then cycle along the coastal path most of which is tarmac and fairly flat. Enjoy