If you are already are fluent in the Japanese language why not go for your japanese interpreter certificate? You can looks for employment at hotels, tour companies or work for the courts. There is a shortage of Japanese interpreters in the Judiciary. Court interpreters work on a freelance basis as independent contractors so you can get an additional job during the free time you have. Depending on their performance on written and oral exams, court interpreters are paid between $25 to $55 per hour with a two-hour minimum.
Application forms may be downloaded from the Judiciary's website at
www.courts.state.hi.us/courtinterpreting or by calling 539-4860. A $75 fee to cover the costs of the orientation program must accompany the application.
Good Luck.