Coin lockers and toilets are hard to find. Taxi drivers, waiters, and waitresses expect tips. Service people sometimes question which bill denomination was handed to them. Policemen may not be available to give directions. Once Japanese arrive at their hotel there may be decisions to make.
Hotels often have safety deposit boxes.
Prices on merchandise are not always marked and some merchants may charge Japanese tourists more because they think Japanese are rich. They may also substitute inferior merchandise. Hotels, rental car agencies and merchants often prefer credit cards. Every year Japanese tourists lose billions of yen because they overlook basic preparations and carry large amounts of cash. Another key is to be a little suspicious of strangers who approach.