Originally Posted by
5khours
Take the NEX. It goes directly to Tokyo Station non-stop, from where you can easily stroll into Ginza. Green car (first) is a little under 5,000 yen per person each way. Regular fare is about half. It takes just under an hour.
You can probably catch a train around 10:18 which will get you to Tokyo at 11:19. For the return, catch a 13:33 train which will get you back to Narita at about 14:28. (If you miss that train there is another one around 2:00, which will get you back in time).
I would avoid the other trains as you have to figure out which train to get on, which stop to get off, and sometimes where to transfer. NEX is easiest and fastest, but more expensive.
I agree with the above, if you must go into Tokyo. However you pull off a trip into Tokyo, you're really only going to have ~2 hours in Tokyo. The Tokyo station itself can seem like a bit of a zoo, and getting lost and trying to find your way will easily eat up 5-10min quick.
Honestly, for the little time you have, I'd forget about Tokyo. It's going to be a real rush. If you're like me and you enjoy a bit of eating and shopping for Japanese goods, then go spend a few hours at the Aeon Mall right near NRT. I could easily spend half a day there.