The message to Laoma reads:
Havana Cuba
Mar 17 1920
Just a line and just arrived this am at 6 o'clock did not enjoy the ride as much as expected the gulf was to rough could not lay in bed as the boat rocked so hard I held my own by hard work will write later
Ever Jeff
Here's another view, showing the magnificent Centro Gallego, now the Grand Theater of Havana.
And here's the back of the card, with a description of the club's origins.