How many days do I need in Japan?

Seven days can support one coherent route; 10–14 days gives much more room for a second region without turning the trip into continuous transfers.

Do I need a car in Japan?

Not everywhere. Use a car where it unlocks rural or island geography, and avoid paying for it when strong public transport already serves the route.

What should I book first for Japan?

Book the hardest-to-replace transport or peak-season base first, then build flexible city nights around it.

Getting Around Japan: Transport Choices That Actually Shape the Trip

Transport is not a footnote in Japan; it determines which itinerary is sensible. Choose the route and mode together.

Himeji Castle Japan · Photo: Bernard Gagnon · CC BY-SA 3.0

What each mode is good for

Shinkansen is exceptional on the main corridors, but a national rail pass is not automatically the cheapest answer; price the actual route.
JNTO notes that oversized baggage above 160 cm total dimensions requires advance space reservation on several major shinkansen lines.
Luggage forwarding can transform a multi-city route by removing large bags from crowded station transfers.
Domestic flights can beat rail for Hokkaido, Okinawa and some long north–south jumps; cars become valuable in rural Hokkaido, Kyushu and island areas.

Shirakawa-go Japan · Photo: 663highland · CC BY 2.5

When a car helps

A car is valuable when it removes repeated rural transfers. It is poor value when it spends the trip parked in a dense historic centre. Price parking, tolls, fuel and one-way fees before deciding.

Transfer friction matters

Compare station size, port transfers, airport access and luggage handling, not just the headline journey time.