I've been to Beijing, Chengdu, and Shanghai many times in 2018 and 2019, both on tourist and on business visa. It's one of the best places I've ever visited. The people are wonderful, the tech is first rate, the food
is first rate. the roads, buildings, schools, concert halls, offices, restaurants, shopping
, attractions, and sights are first rate - at least in the places I visited. I had local escorts at times, but was always free to travel on my own using the taxis, uber, bullet trains, and plentiful airlines.
While in Shanghai I saw a Nordhavn, probably a 62', in a marina area alongside the river near the financial district. I didn't get close enough to see a hailing port, but at least you know it's possible to bring a vessel in and visit.
Once CVD is over I recommend China for a visit. There's nothing like it, and you'll be amazed to see how they have advanced far ahead of the US and UK.