[Paul11]

Not much possibilities, unfortunately. You can teach English, but if you're not fluent in language and non-verbal communication, very difficult. Also important is where you live. My time is usually spent in the country side, there's nothing. If your tech or business minded you may find work in a company in tokyo or other huge town.
Also, most folk who stay longer than a few years tend to go bonkers. People I met who where there for six years tended to be a little bent. Strange look in the etye and never knowing the date.
Have your lady visit the states, too and you can decide where you want to stay!
Wishing you good luck!