landing i shanghai. can u make itinerary of shanghai, hangzhou, suzhou and nanjing in 4 days. thanks

Well, 4 days is short to visit those four cities on your own. You may get a hurry among them through there are bullet trains among those cities for you to travel around. There are some tour packages of travelling around Shanghai in this webpage: https://www.travelchinaguide.com/package/shanghai.htm. You may take it as a reference. Or you could join a local tour to the four cities which may save a lot of time.