What are the necessary items for cruise tourism?

There is usually everything on a cruise ship, and there is no need to prepare anything. Of course, some people will continue to take medicine or something, so this medicine needs to be brought by themselves. If it's ordinary medicine, it's usually available on board! At the same time, parties, dinners and so on. They are usually organized on cruise ships, and there are some formal restaurants. This requires formal attire, otherwise people won't let you in, so you must prepare formal attire on the cruise ship!