Stu- I was on that trip and several people said it was a Marlin-3 to be exact about 4 feet long. We cruised right by them and it had its dorsal out of the water. The fin did not continue down its back like a Sail does....
Search your wi fi settings when you are at a place. If its available, they will ALWAYS give you the password. They want you to stick around and drink/eat.