as far as i' aware it depends on where you're from; Americans have it different from the rest of the world :S
bear in mind the new legislation japan brought in last year; they will take things such as your fingerprints and personal details when you enter the country now; it's all part of their supposed 'fight against terror'
when i went across; it was only for 11 days, so we just had to fill out customs forms and stuff, but that was 3 years ago
