water park should be open in Murcia.. if you follow the Alhama road and then take the Murcia exit you will come to Terra Natura / Aqua Natura Murcia. Its easy to find on the AP7.. If this isnt open the Benidorm one may be as its one of the biggest in Europe
http://www.terranatura.com/Eng/AquaMurcia/Ficha3.aspx?FrmCodA=6&FrmCodB=71&FrmCodC=130&FrmRegistro=1&FrmInicio=S
we where told when we went that its now open all year round..
They also have carting there, but at 8€ for 10 minutes its not cheap. may be worth having a look at Espuna Adventure
http://www.espuna-adventure.com/