Which entry of China Visa should I use?

I plan to got to China twice at two different dates. On Sept 27, 2015 Celebrity cruise will be disembarked in Shanghai as I will fly out of Shanghai for USA. Another cruise on Nov 1, 2015 Celebrity will be disembarked in Shanghai for shore excursion for 8 hours 30 min tour during the full day as the ship will be arrived at 6 am until 10 pm to leave Shanghai and also on Nov 7 the Celebrity cruise ship will be disembarked at 7 am in Hong Kong for an overnight until Nov 8 morning as we will go on shore excursion tours about 5 hours on Nov 7. I need to know which entry and validity should I apply? Multiple entries? When is best time to apply before I will board the ship in Vancouver on Sept 11 for Transpacific cruise? Should I apply for Hong Kong? Please advise.