If you are planning to visit the Eastern part of Japan by rail, the JR East Pass is a great pass to get your around. It is a 5 day flexible pass, which means you can use it for any 5 days within a 14 day period (not necessarily consecutively)!
You can use it on any JR lines operated by JR East, including reserved seats on shinkansen.
For my trip to Japan in June 2009, this was how I utilized 5 days of my JR East Pass:
Day 1: Tokyo – Koriyama – Aizu Wakamatsu – Koriyama – Sendai
Day 2: Sendai – Matsushima – Sendai
Day 3: Sendai – Yamadera – Morioka
Day 4: Morioka – Omiya – Nagano
Day 5: Nagano – Matsumoto – Nagano – Tokyo
All the above train routes were fully covered by the JR East Pass, we were able to cover quite a big area with it!
Currently, the price of the pass is 22,000 Yen for adults (12 years and older) and 11,000 Yen for Children (6-11). For more information regarding the JR East Pass, visit the official website.
This post is archived under my Japan Travel Blog: