Japan has an excellent public transportation system, with many different options available to travelers. The bullet train is a fast and efficient way to get between cities, but can be expensive. Local trains and buses are cheaper, but can take longer. Visitors should also consider purchasing a Japan Rail Pass for long-distance travel.
If you have more time, consider adding a visit to the snow monkeys in Nagano or the historic temples of Kamakura. If you have less time, consider skipping Yakushima and Mount Fuji. Remember that many attractions in Japan close early, so be sure to plan your day accordingly. It's also a good idea to bring cash, as many smaller shops and restaurants do not accept credit cards.