We are going on a cruise from Hong Kong to Shanghai

We are going on a cruise from Hong Kong via Mannilla, Taiwan,Japan to Shanghai
The cruise ship Volendam stays over in Shanghai and we also. The second day in Shanghai we booked already a hotel room and leave the country after 2 days on a confirmed flight with Emirates. Total hours in Shanghai is less than 144 hours.The Holland America line say it is necessary to have a Visum. So what’s to do