What you do:
Make toy sailboats with clean Styrofoam meat trays. Insert a straw or glue a paper roll into the tray for the mast. Use different craft items (paper bowls, craft sticks, pipe cleaners, etc. to make your ship. Cut triangular sails from colored construction paper and tape to the paper roll. Your child can sail her/his boat in a bathtub, a swimming pool, or a tub of water.