Lots to do here .... swimming, gymnastics, karate, dance etc. Many schools also offer after school activities (some u pay for some are included in the school fees)
There's a lot of Curricular activities in dubai , but I take my little devils to Adventure Zone , it is both affordable and rich in providing customer satisfaction. They provide a variety of hobbies such wall climbing , ninja warrior courses, skateboarding, and much more . My son enjoys trampoline jumping and ninja warrior course.