This year lists were arranged by the school at E15 each each way which worked really well. So I am hoping that this will be the arrangement again for next year. Otherwise you can get a taxi from outside the airport but it would be quite pricey although you could arrange to share.
It is also possible to get there by metro and bus. We used the metro and bus a lot while we were there to get around and the service is really good all air conditioned.
Are you going to be at the bungalows? I am hoping there will be other kids/teenagers there again next year as that worked really well. My daughter is 13 and met loads of others and they would all go in the pool together in the afternoon.