Castle: adult €5.00. Group and senior citizen €3.00. Child / student €2.00. Family rate €10.00. Bus prices €3.00 ( adult return ) Concession €2.00. Single adult €2.00. Single concession €1.50. Group rate ( for a group of twenty or more ) for shuttle bus and a guided castle tour is now €5.00. Admission to the park and visitor centre is free.