I dunno if you are aware that Chinese citizens can book short tours to two South Korean islands as part of a tour group. Included in the holiday package is a one-way sea cruise sailing from Shanghai Port, and returning to Shanghai by air. They need their Chinese passports. No South Korean visas are required, and their passports are therefore only inspected, and are not stamped. The main island is Jeju. The picture is of its sandy beach

China's Hainan Island could develop its tourism by adopting such a system to attract more western tourists.

Just a thought!