The JET Scheme is not for kindergarten kids. You will be teaching at junior high and high schools. If you really want to teach young kids, then the JET Scheme is not for you.
JET Teachers don't know where they will go. It's pot luck and some love their locations whilst others get their nose out of joint. Of course you can put in your preference, but expect the worst.
Money is great and so are the long holidays and short teaching hours. It's a very lucrative job to get.
You can see a testimonial at
JET Testimonial.
JET really is a stress free life and great for the first-time visitor to Japan.