What are the common forms of entertainment in Japan (i.e. music, department stores, public baths,  movies, theme parks)?

What is the national sport of Japan?

What is the most popular sport in Japan?

What is the primary means of transportation in Japan (i.e. cars, bus, train, taxi, bicycles)?

What are the different rules and regulations regarding Japanese transportation compared to the U.S?
( For example: What is the legal minimum age for getting a driver's license and what does it cost?)