I remember this movie from when I was very young, but I can't remember the name of it now. It must have been made in the late 80s or early 90s. It was about a little boy and his grandma, they go to the beach. The boy is looking for sea shells and they see a bunch of trash all over the beach. Then they go into the ocean and befriend ocean animals and are helping them clean the trash. It was a musical and a message movie about not littering, save the ocean, etc. I know that it's live action when they're on the beach, but I can't remember if it's cartoon when they're in the ocean or not. It may have been all live action. Please help, I can not think of the name and it is killing me with frustration. Thank you so much!