Final answer:
Cruise ship cabin crew may have varying policies regarding accepting tips which are often included in service charges. For cruises with a cashless system, all services, likely including tips, are billed at the end, but passengers can consult crew or customer service if they wish to offer a cash tip for exceptional service.
Step-by-step explanation:
Generally, the policy for accepting tips by cabin crew varies depending on the airline or cruise line policy. However, for cruise ships that operate with a cashless transaction system for onboard services, tipping is usually included in the service charges and distributed among the staff. In these cases, passengers pay a comprehensive bill at the end of the cruise that includes service charges. In the scenario provided, both single travelers and couples on a cruise from Los Angeles to the Mexican Riviera have their onboard bills summarized at the end of a seven-day cruise, suggesting that they typically do not need to handle cash or tip individually during the cruise as service charges and tips are likely accounted for in their final bill. Nonetheless, if a passenger feels inclined to offer a cash tip for exceptional service, policies on whether this is acceptable can vary and it's best to consult with the crew or customer service on the cruise.