I asked Google AI what is the most popular cruise ship in Japan: Several major international cruise lines operate an extended season of sailings around Japan, attracting both Japanese and international travelers.   Diamond Princess:   This ship is arguably the most famous international vessel to homeport in Japan. Princess Cruises has a significant and long-standing presence in the Japanese market, offering a vast number of itineraries and sailings around the islands. So I searched further and found:   The Best Japan Cruises 2026:  An Insider's Guide to Unforgettable Cultural Experiences. Want to experience authentic Japanese culture and festivals—but not sure where to start? Wondering when’s the best time to cruise Japan? Curious if you’ll actually get to explore those historic sites you’ve been dreaming about? There first is a list of the top three cruises for 2026: #1  Diamond Princess          Japan's Top 3 Festival Cruises...