Japan Ferry Tour for 12 Days: Niigata (1 night) – overnight ferry (1 night) – Sapporo (1 night) – overnight ferry (1 night) – Sendai (1 night) – overnight ferry (1 night) – Osaka or Kyoto (1 night) – overnight ferry (1 night) – Yufuin (1 night) – overnight ferry (1 night) – Tokyo (1 night)