Cruise from Hongkong via Xiamen (Province Fujian), Shanghai, Tianjin (Peking) to Tokio (Japan).

On this cruise tour we will stay in the three cruise ports of Xiamen, Shanghai and Tianjin for about 10 hours for local organized group excursions. I assume that I don´t need any visa. Or is it necessary even if I´d not leave the ship in oneof these harbors?