In Japan, the public transportation  is very accurate and has a efficient network. To travel across the board, the train ( JR ) is the best way to go around. JR offers Japan Rail Pass which offers you unlimited transportation ride within the limited day for oversea travelers, also which covers parts of Shinkansen ( the bullet train ) ride. In the city, the metro or bus is a convenient way. Bringing the IC card ( e.g. SUICA, PASMO, ICOCA, etc ) makes your travel more convenient, even you can purchase food, beverage at the konbini, some of supermarkets, and some of the vending machine. JAL and ANA are 2 top Japanese airlines, however LCCs ( Peach air, Jetstar, Skymark, etc )offer the cheaper domestic and international flight to make you be able to travel further in Japan.