If anyone is serious about a chocolate-oriented Do, consider Paris during the Salon du Chocolat, late October/early November. Belgium may be a superior source of chocolate--I can't address that from experience--but Paris certainly puts on a good show, about four times the size of the New York Show. Maybe someone who has attended the Tokyo edition can chime in. One of the Paris exhibitors told me that Japanese tour groups travel to the Paris show after experiencing the Tokyo show--this as I watched one renowned chocolatier being mobbed and photographed like a rock star.

Arrive early, sample often ;-)