Yotsuya (四谷  or 四ツ谷) is right in the middle of Tokyo and is home to Sophia University (上智大学).  The area is teeming with bars and restaurants, the best of which I will mention here.  
Za Morrigans is located just past Sophia University's main gate.  When you exit Yotsuya station (Use the yellow Chuo Line  //  中央線)head away from the bridge and cross the street.  You want to be on the same side of the road as the University (easily recognizable).  Pass the University and continue for approximately 1/2 a kilometer.  Za Morrigans is on the second floor on your right hand side.  
If you want good food, follow the same directions to reach Za Morrigans, but take a right at the first side street past the main entrance to Sophia University.  Pass the post office and follow the road down a hill.  On your left, there will be a small chinese restaurant (look for a vending machine as the doorway is easy to miss).  This restaurant offers astonishingly good noodle soups.  Ask for their specialty.
If you want something a little more in-the-middle of things, head the opposite direction out of the station.  When you cross the bridge, take a right and walk along the edge of the park.  You will see an alleyway on your left full of small restaurants.  Of, if you continue straight for another block or so, you will find a Subway to fill your western-food craving.

I heard a rumour that the Resident Evil 1 opening was filmed at the River Tama...It is just rumour.. It is a residential area and theres nothing much to be seen there i guess..

Skip it, there is nothing here... unless you are interested in seeing the gates of an U.S. Army Supply Depot.

If you find yourself in Machida, there are great little restaurants all up and down the main drag. Most any noodle shop within walking distance from the train station and from tadao san chome is great.

water park. very nice. nsndfnsdondosfniodsnfodsnfo dsfnidosnfo dinsfoidnsof 

stepping out of the shibuya JR station...the first sight might be a bit overwhelming with the massive amounts of people who never seem to move and the bright lights. Don't fret...as you continue down the smaller side streets lined with shops, the crowds will thin down. Head into Shibuya's 109 and experience some interesting teen clothes. Everyone is super friendly but always in a mad rush. There's a good restaurant called Gonbachi's (1-13-11 Nishi-Azabu Minato-Ku, Shibuya, Japan) that westerners and locals alike enjoy eating at.

Shibuya has the most busy intersection I have ever seen and probably in the whole world. Also the exit outside of the train staion called "Hatchiko" shows not only a cute akito dog statue named hatchiko ((sugoi kawaii inu~hatchiko)), but the exit to and entrance from the busy intersection. Litterally THOUSANDS pass here every few minutes.

If you want to do something in Japan, this is the pace for it. MANY Izakaiya's ((japanese style bar)), MANY different styles of food, Clubs and shopping. It is a rather big station so I recommend getting out Hatchiko exit to the main streets.

Citi Bank is found here, also the lovely "Moss Burger" is found here. Pet Stores, massage, Love Hotels, Captsule Hotel, Karaoke ((my favorite Big Echo)) and Electronics. I have noticed the longer I was there and closer to fall, so much homeless was there. They even had a cardboard box houses built under the bridge outside of the Hatchiko exit.

If you go out the East Exit, you will find a large over the street ramps to get across to book stores, 7-11, music dealers, more food places, one main building has a grocery store in the lowe levels. This is just around the corner from Hatchiko exit.

So easy to get here, it is accessable on the main JR Yamamote Line next to Harajuku. Getting around is like most of Japan, you will walk. Its so safe you can wander any time, day or night, with friends or without. The only thing is if you do not like a crowd, go a bit later bc most nice days, there is no room for anything, and I am not exagurating that!

And like I say about most of Japan, it is SO safe, dont need to worry about getting things stolen as they people in the shops will chase you if you leave even a single yen!!
Also a good feature is mostly ALL toilets are washlettes, even in corner stores, at the cash is always a reciept tray so you dont need to take it with you, and also when they say "Irrashaimasen" they are welcoming you into the store. If the keep saying "yasui-yasui" mans very cheap or literally CHEAP CHEAP! And in most palces in Tokyo, you will find drink machines on almost every corner.

The best place to take money out from Debit cards from over sea's are the 7-11 machines which comes in English and other languages, or Citi-banks.