Draw a sunny day at the beach scene on light blue paper.
Color the scene.
Color Disney characters and glue onto the beach scene. Or use double stick tape.
Place finished blue beach scene in a gallon size slide Ziploc bag.
Add a couple scoops of blue sand and a couple scoops of white sand to the Ziploc bag. Zip it closed. (Add more white then blue so it looks like the ocean water.)
You can end here or add some light brown paper to the bottom of the ziploc bag with another beach character playing on the sand. Use double stick tape to keep this down.
Children can see movement like a scene in a movie by moving the Ziploc bag up and down. The water moves like an ocean.