An acquaintance of mine, a retired English professor, goes on free cruises frequently, but she does it because she teaches on the cruise. She said that when she goes to the Panama Canal, her job is to research the canal and give 45-minute talks on it. She is vague about how to contact the companies. She said she does not contact the cruise lines directly. I have been very interested in this since I have experience in teaching, doing research and making speeches. Does anyone have any insight on this?