What I have done in this piece is to use both hands to play the 'rhythm part' on the Lower manual with piano; then play this back and whilst listening to it add the melody on the Upper. A 'double' recording, which I can do on my organ as I can record the manuals separately.
I have ended the piece with 'waves breaking on the shore'.
From Wikipedia:
Calypso is a style of Afro-Caribbean music that originated in Trinidad and Tobago during the early to mid-19th century, and eventually spread to the rest of the Caribbean Antilles and Venezuela by the mid-20th century. Its rhythms can be traced back to West African Kaiso and the arrival of French planters and their slaves from the French Antilles in the 18th century.
Calypso Carol
Hugh