Cash - The Japanese mostly use cash for paying for things. Most stores in Japan don't accept credit or debit cards so you should remember to bring plenty of cash with you. You can also bring traveller's checks and exchange them into yen at a local bank. Moreover, big cities such as Tokyo and Kyoto are very expensive and they are full of things you want to buy as souvenirs. Only buy the most unique things and don't make yourself broke right from the beginning of your trip.…