I'm debating the same thing. I'm actually thinking of doing all three - Shanghai, Hong Kong and Tokyo - while we're in that part of the world, but that's going to depend on some professional decisions I make in the next few months and whether or not I can take as much time off as a trip like that would require because I don't want to cut into our time in Japan to do it. Hitting all of the global Disney parks is something of a bucket list item for me and my youngest (if a 10yo can be said to have a bucket list
), so it is really tempting to try to fit one or both in while we're in that part of the world rather than waiting for a separate trip to Asia. But then I second guess myself and get to thinking this probably won't be our only visit to Japan so maybe it would be better to focus on just a single country for the first trip.