I was very surprised in the tour description of how they have regular sight seeing activities planned on the days that you go to HK and Shanghai Disney. One day doesn't seem like nearly enough time to explore a new park you've never been to, much less a partial day.
Preaching to the choir here, but China is so vast if you're there for 2 wks, something's gotta give. I loved the classic China
ABD. It really hits the major sites, but there's so much they have to leave off. I don't think it's ABD's fault. They just run out of time.
I believe you get to HKDL around 3:00 and have maybe 4 hours to tour around before dinner at the Plaza Restaurant. A number of the teens on the trip skipped the final dinner to hang our in the park more. I was jealous.
ABD guests are interesting. Before I went on an ABD I would have guessed all ABD guests are hard core Parks fans, but that's just not the case. I didn't pole everyone about whether they felt they had enough time in HKDL, but I'm sure a number of them were completely satisfied with their few hours. Case in point, there was one other family who stayed several days extra in HK and they didn't go back to HKDL. They actually spent a day at Ocean Park (another popular park in HK). So, I'm sure there's a range of opinions out there. For me I'm pretty passionate about both traveling and Disney Parks, so that doesn't help much.
For me, I was able to Mystic Manor a couple of times, Grizzly Mt, one or two rides in Fantasyland, and shop a bit down Main Street. I did not get to Tomorrowland, skipped most of Adventureland, wasn't terribly interested in Toy Story Land... I think you need at least a full day there. So we went back 2 more mornings after the ABD was over.
I'd equally stress much is left out of HK. Most notably seeing the HK skyline lit up at night. Shanghai is kind of the same way, except in the classic China ABD you do have dinner on the Bund with the opportunity to go out to the balcony to see the skyline. If you do nothing else in these 2 cities you should see them lit up at night if only briefly. They are the 2 best skylines in the world. But you also don't get the chance to see the HK streets lit up at night, like Mong Kok with all it's neon. The food HK is famous for... It's a really cool city.
It's a great ABD. One of my favorites, but it needs a couple more days on each end.