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See also the Master Thread at the top of this page.

What to do during a ___ hour layover has to be the single most asked and answered question in this forum.

In short, it takes an hour or so to transit C&I, then some more time to obtain money and find the train station. The train into Tokyo takes between 1 and 1-1/4 hours. Finding your way out of Tokyo Station and to the cab stand, add another 1/4 hour. Then go somewhere, spend some time visiting, followed by another cab ride to Tokyo Station and another 1-1/4 hours on the train back to NRT remembering to get there at least 2-1/2 hours early to transit Immigration and security. You would have 4 to 5 hours in Tokyo. Certainly enough time to see and do a few things but you would have to budget your time. I think the general consensus around here is that the break point for whether or not it is "worth it" to try for a trip into Tokyo during a layover is around 7 hours.

In case you were not aware, the city of Narita is only a 10 minute train ride and is a very nice place to visit for a few hours. There is a nice shopping street, several good places to get a good Japanese meal and a beautiful temple/park to visit.

You can go into Tokyo and spend a hurried time seeing one or two things or you can spend a peaceful relaxing visit in Narita. Your choice based on your personal needs and travel patterns.

If you do go into town, I wholeheartedly endorse Richard's idea of using the Skyliner instead of the Narita Express. Better, more comfortable and less expensive, it takes you to Ueno, which is a good destination even if you don't connect to anywhere else. Ueno Park, Ameyoko shopping arcade, lots of stuff to see. And Ueno is a good jumping off point to other parts of the city.

JR