What China is doing with Hainan - a huge island (50 times the size of Singapore!) - is pretty extraordinary: they're basically making it into a completely different jurisdiction from the rest of the country, and an extremely attractive entry gate for the Chinese market.
https://www.facebook.com/BrugesGroup/posts/pfbid0kG2N2vrkCF4eebCteGaRngxYCnTXtibbJdJk39KM4XJEuBWcVnKAnKrf19XFXzZZl