Probably more of a long con, but can you start a side business relevant to the areas you'd like to monger in?
Random example, if I wanted to explore Guangzhou more, I would say I'm starting a clothing or cosmetics business and need a few days to meet with clients.
If relatives ask you to stay with them, you can cite early morning departures / late night arrivals back home as a reason to get your own hotel -- you'd hate to disturb their quality of life. If they persist, you can also stress wanting to have a professional atmosphere to receive clients or the fact that such a hotel stay would be considered a business expense. You can also say you got the hotel for free with credit card points.
You don't even necessarily need to start these businesses -- you can just be researching and wanting to meet with the relevant vendors.
If you're American, you can say you're trying to think of a drop shipping business and have a few leads in China or Hong Kong that you'd like to associate with.
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