Suggest you go to cruise critic site and go to boards section and then to ports of call for useful info on how to diy in these places.
Great cruise and yes look at the tourists sites for the many ports. A few things I would love to repeat would be have a coffee or a bee in the Continental Hotel in Saigon ( or Ho Chi Minh City as it now is ) and immerse yourself in the history of the newsmen sitting here during the Viet-Nam war. The Nuclear Bomb Memorial museum in Nagasaki is su8ch an emotive place and will probably bring tears to the eyes of even the toughest men. My one big delight of that cruise was ballroom dancing in the streets near the Bund in Shanghai with loads of Chinese couples all enjoying themselves and dancing so well. Beijing has so many things to offer I cannot single any out specifically. I envy you this one ....Leanne Dow.