Japan: Get a Japan Rail Pass.

This pass offers unlimited travel on Japan Railways (JR) trains. A one-week pass is less expensive than a regular round-trip ticket from Tokyo to Kyoto on the Shinkansen. Note that you must obtain a rail-pass voucher prior to departure for Japan, and the pass must be used within three months of purchase. The pass is available only to people with tourist visas, as opposed to business, student, and diplomatic visas.