I think your options are:
- Student visa: register for classes, pay tuition, and get the visa. Optionally, attend class.
- Work visa: find an employer that can provide a visa and work the minimum number of hours. The easiest option would be teaching English, and I imagine the minimum amount of hours per week must be something like 10-15 hours.
- Use guanxi if you have it to get someone within an organization that can supply visas to provide you with one. You might have to pay.