Visa Required for Beijing and Shanghai

Hello. . .I am on a cruise with Silversea. . .we arrive in Tianjin Oct 28 at 7am and depart Tianjin Oct 29 at 7pm. Then we arrive in Shanghai Oct 31 at 5pm.

Q1 --- I am going on excursions while we are in port in Tianjin. Do I need a VISA?
Q2 --- I arrive in Shanghai Oct 31 at 5pm and fly from Pudong back to Montreal Nov 03 at 6:15pm. I will be visiting Shanghai for 3 days. Do I need a VISA?

Thank you.