My daughter and I made up hand motions to The Mermaid when she was in Kindergarten. I go back to her old elementary school every year, and The Mermaid (with hand motions) is always a favorite.

...AND THE OCEAN WAVES DO ROLL...
Interlock fingers of both hands in front of you and undulate both arms in "wave" fashion

...AND THE STORMY SEAS DO BLOW...
Put both hands in front of you, palms up and arms locked as if motioning someone to stop. Move arms forward and back by locking and unlocking elbows. After you say "BLOW", blow gently (DON'T SPIT!) twice.

...AND WE...
Gesture to yourself with your right thumb.

...POOR SAILORS...
Salute with three fingers to your forehead, as if you were a Boy Scout.

...ARE SKIPPING...
Make a little walking man with the first two fingers of your right hand.

...AT THE TOP...
Make the "thumbs up" signal with your right hand, and raise your arm from waist to shoulder level.

...AND THE LANDLUBBERS...
Cross your arms across your chest and touch the opposite shoulders with your hands, in the "love" sign from American Sign Language.

...LIE DOWN...
Put your palms together and put them to the right side of your head, as if you're taking a nap.

...BELOW, BELOW, BELOW...
Make the "thumbs down" sign at about chest level, and wave your arm downward with each "Below"...

Repeat the last three signs when you re-sing those last three lines at the end.

- Al