Do I need a Visa or is the 144h exception valid.

I have a german passport and traveling by cruise. We will start with a few ports in Japan and then staying for one night in shanghai and then we will leave with the cruiseship to ports in Japan and taiwan. The end of our cruise will be Hongkong. Then we will fly back to germany. Do we need a Visa for shanghai and Do we have to book a tour?
Thank you for a answer