The JET program is the job to have if you wish to teach English somewhere. Good pay, set hours and many perks, much better conditions then even the best English schools in Japan. You come for a one year contract, which can be renewed up to two times so someone can spend up to three years on the program. One can request a placement on the application form but don t hold your breath.
Most placements are in small cities or towns where there are few foreigners.
You could very well be the only foreigner in the town. The rural location you get will give you a very different experience than those who have worked in Tokyo or other big cities which have all the amenities of home, I guess it gives you a rare experience then most people who come to Japan. Meaning my area has mountain temples, rice paddies and monkeys which offers a much different experience then most other foreigners who come to Japan. You work with a Japanese English teacher in a team teaching environment. Your job is to help internationalize Japan and help teach practical English.