A 28-year-old woman plans to embark on a week-long ocean cruise. She reports a history of severe motion sickness characterized by nausea, vomiting, and dizziness during previous boat trips. She has tried over-the-counter remedies with minimal relief. She has no significant medical history and takes no medications. Which of the following prophylactic regimens is most appropriate to prevent her motion-induced nausea and vomiting?