So we're going to arrive in tokyo at around 7:00pm after something like a 14 hour plane trip from Sydney.
What part of Tokyo would be recommended for college students who recently graduated? We're all computer science graduates and only a *little* bit nerdy..
I heard roppongi is overrated, but that's where all the foreigners are. Would that be a better idea?
Do you mean that you're arriving at around 7pm in Narita and getting on the bullet train at 6am the next day?
Assuming it is so, Roppongi is not the place to be. It's a place to enjoy the night life--bars, clubs and restaurants. You might get too drunk and miss your train!
Plus, hotels in Roppongi are on the expensive side, even the cheaper ones.
(Since you're all young, you may be able hang around Roppongi and have fun until the first subway train in the morning. I don't recommend that, but it's your choice.
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Regarding transportation to central Tokyo at night, 7pm arrival is not late yet. You'll have transportation to get to Tokyo Station, where I assume you'll be boarding the Shinkansen. I've checked and found that the Airport Limousine bus operates until around 11pm. I think that's good enough for you.
Limousine Bus by Airport Transport Service Co., Ltd.
Also, I doubt we're going to last until 6am the following morning where we'll need to get a bullet train to nagasaki.. what's a good late-night accomodation option? Or should we check into the hotels first?
You need to rest, even a little. (I'm a mother!
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I personally think you should stay the night close to Tokyo Station, so you can board the Shinkansen straight from your hotel, without the bother of riding subways, changing trains, etc., so early in the morning. (I doubt whether there are trains that get you to Tokyo Station on time in that early part of morning.)
If you're looking for cheap lodgings, why not try out the famous "capsule hotel"? I found one that is within walking distance from Tokyo Station.
http://www.naniwa1001.co.jp/first/first_english.htm
This one is a regular small hotel catering to business travellers--a bit more expensive but is only a minute away from the station.
[URL="http://www.hotel-heimat.com/index.html"]http://www.hotel-heimat.com/index.html[/URL]
The link above takes you to the Japanese toppage. Click on "English" at top right for info in English.
Hope this helps!