If you are an employee paid with a W-2, then the airfare back home is not a deduction.
If you are an independent self-employed contractor paid with a 1099-MISC and reporting your income and expenses on Schedule C, then your airfare may be considered to be business travel. Even then you would need to consider whether or not you also have earnings in your home location or only based out of Miami and on the cruise ship. If the majority of your income is from your work on the cruise ship or Miami, then that is considered your tax home and your travel would not be deductible.
