This question already has an answer here:
I'm a canadian citizen. i have a stopover to japan going home to canada and will transfer from tokyo HND airport to tokyo NRT. Also, I have layover of from 4 am in the morning and be leaving at 6 pm of the same date. I'm planning to have a 1 day sightseeing outside the airport. Do I need to get a visa or any documents so i can go out?