To sign up for a Guided Tour:

You can make a reservation for same-day Guided Tours at the Guest Relations counter, available on a first-come-first-served basis. Numbers are limited, so please book early. The counter is open from Park opening.

Advance reservations:

Guests who book a Disney Hotel through the Tokyo Disney Resort Reservations Center can make advance reservations for the Guided Tours. Reservations can be made up to one day before, subject to availability.