I finally found the correct title for the song. It goes by the name: "The Thousand Islands Song" (Oh Florence) I also found a short audio clip that goes: ...if we had only met down on the Isle of Capri
Now I just can't find the place you marked on the post card, call the Navy and Coast Guard, where oh where can you be.
I must not take a nap, gotta watch the map, that was island 793, row from shore to shore, knock on every door....

Cap't Bob