Traveling to Japan can be a rewarding experience, but it is important to remember to carry your passport with you at all times. This serves as proof of identity and citizenship if stopped by police or immigration officials, as well as proof of age when visiting certain establishments. Not carrying your passport can have serious consequences, including being arrested or detained. Additionally, it is not recommended to keep a copy of your passport while in Japan and other necessary documents should be brought along such as travel insurance policy, return ticket, hotel reservation information, credit cards and cash. If you lose your passport while travelling in Japan there are steps to follow such as contacting the nearest embassy/consulate and applying for a replacement document.