Now I understand why you take such a short trip of such as 3nights/4days tour to Shanghai. You are afraid of leaving your home longer duration and you want to get back home soon after leaving your home.
Yes, home is the best place to stay. Then I wonder why you go out just after getting back from Shanghai for cultural activities, eating out, so on. You are really active person with very good healty mind and body. Anyone of your same aged people can not follow your active life.
They that be in hell think there is no other heaven.
The hermit thinks the sun shines nowhere but in his cell.