Arrive in Shanghai Oct 15 (PVG) & leave via Cruise ship Oct 17 for Busan, Korea? 72 or 144 TWOV ?

The cruise leaves Shanghai then goes to Korea, Taiwan, Phillipines, Vietnam and then we arrive in Hong Kong Oct 28 and do excursions and leave the ship on Oct 29th for Hong Kong airport. I believe I only need my USA passport and do not need a visa? Please help me with this ASAP as I keep getting yes I'm okay but the language barrier and cruise forums .... plus no one answers at the Houston China consulate and I need to know very soon please.
Thank you, Marisa
PS, When you answer my TWOV questions please also send me a link for excursions in Shanghai and also Hong Kong please