The Japanese media are looking for non-Japanese.
There are many areas where Gaikokujin, or non-Japanese are wanted in Japan. Opportunities for Gaikokujin may include appearing on TV, being interviewed by a magazine, taking part in research. etc.

Probable opportunities.
Appearing on TV & in movies
News source for media
Model for photo contests
Image photo shooting for magazine articles
Event companion
Flyer distribution (fun stuff)
Research subject (even funny stuff)
And many other interesting work opportunities.
and of course.....
Alternatively, many Japanese are very keen to study foreign languages, especially English, and are looking for conversation partners. As a native-speaker, you will be very much in demand by these language students. Available opportunities may include being a conversation partner for Japanese language students.