When you book a post cruise package they offer this service. They essentially take you luggage to a local hotel they have contracts with and take you sight seeing. When your excursion is done they take you to catch up to your luggage and then you and luggage to the airport. When you book the package they'll give you instruction on when and where to put it and some special tags to identify where it needs to go. My sister did it recently in San Juan and said it worked well but I didn't ask for many other specifics.