[header] How to stay healthy on a cruise vacation [title] Get vaccinated. [step] Before departure, make sure you have received all proper medical vaccinations to stay healthy onboard the ship and at ports-of-call. There are many infectious diseases and illnesses that can spread while onboard the ship or in foreign ports. 
[substeps] Make sure you are up-to-date on all required or recommended vaccines in your home country. In addition, contact the cruise line and health organizations such as the u.s.