Funny, I was just looking at excursions for PANDA and for the next segment. We also are interested in going to the acrobats in Shanghai. I still need to do some research on Nagasaki and on Pusan. I don't think there is much (if any) experience from Regent cruisers on these ports.
I was also looking at your Vietnam recommendations. However, thus far, I don't see the helicopter to Hanoi on Regent's list. For Saigon, I did not see the Cao Dai temple mentioned on any of the excursions, including the Cu Chi Tunnels. I have a link to guides that I think you used (trailsofindochina), but I'm not sure at what ports these might be relevant or if last year's cruise went to the exact same ports. (Can you send me your review of your time in Vietnam if it is handy?)
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Eugene