Flipper

A teenage boy sent to spend the summer with his eccentric uncle on the Florida coast befriends a remarkable dolphin and takes on local bad guys who are polluting the water.
Sandy Ricks is sent by his mom to Coral Key, a rustic island in the Florida keys, to spend the summer with his uncle Porter Ricks. Sandy dislikes everything about his new environment until a new friend comes into his life, a dolphin named Flipper, that brings uncle and nephew together and leads Sandy on the summer adventure of a lifetime.