Alcudia's Hidropark is a great day out for all the family.
You can stay here all day. The kids will never get bored.
It's got giant slides, three (landscaped) mini-golf courses and numerous swimming and boating pools. It's also got a wave pool, and plenty of fast food type outlets selling "chips with everything".
You can also The park is open every year from early May to the end of October.