Tokyo Dome

Tokyo Dome City is a leisure complex in central Tokyo consisting of the Tokyo Dome baseball stadium, an amusement park, the LaQua spa, a variety of shops and restaurants and Tokyo Dome Hotel.
The amusement complex used to be known as Korakuen, named after the former baseball stadium, which in turn was named after nearby Japanese landscape garden Koishikawa Korakuen.
Tokyo Dome City experienced a boost in popularity when LaQua, an indoor spa complex with real hot spring water, was opened in 2003.

Shinjuku is one of the 23 wards of the metropolis of Tokyo, but commonly refers to just the large entertainment, business and shopping area around Shinjuku Station.
Handling more than two million passengers each day, Shinjuku Station is Japan's busiest railway station, served by six railway companies and about a dozen railway and subway lines, including the JR Yamanote Line.
West of the station is Shinjuku' skyscraper district, home to many of Tokyo's tallest buildings, including several premier hotels and the Metropolitan Government Office, whose observation decks are open to the public for free.
Northeast of the station lies Kabukicho, Japan's largest and wildest red light district, while department stores, subterranean malls and electronic shops surround Shinjuku Station on all four sides, including the recently redeveloped south, where the pleasant Southern Terrace is located. Redevelopment there is still ongoing.
Points of Interest:

Tokyo Metropolitan Government Office (Tocho) The 243 meter tall twin towers and surrounding buildings contain the offices and the assembly hall of the metropolitan government of Tokyo, as well as observatories on the 45th floor of each tower. The view from the southern tower is considered slightly more interesting.
Open daily 9:30 to 23:00 (south observatory until 17:30), except December 29-31, January 2-3 and occasional inspection days. Furthermore, the north observatory is closed on the 2nd and 4th Monday and the south observatory on the 1st and 3rd Tuesday of each month, except if a public holiday falls on the closure day, in which case the observatory is closed the following day. Admission is free.

Shinjuku Skyscraper District Among the skyscrapers are the Tocho (see above) and some of Tokyo's leading hotels, including the Keio Plaza, Hilton, Century Hyatt and Park Hyatt (featured in Lost in Translation). Several of the other skyscrapers have some shops on their ground floors and restaurants with great views of the city on their top floors.
The restaurants in the skyscrapers tend to be open from around 11:00 to 23:00. Some restaurants close for a few hours between lunch and dinner.

Kabukicho Named after a kabuki theater, whose construction plans have never been realized, Japan's largest red light district features countless restaurants, bars, pachinko parlors, love hotels and a wide variety of red light establishments for both sexes and sexual orientations. Explore with caution and beware of exorbitant cover fees.
Kabuki-cho comes to life daily after 18:00, and especially so on Fridays and Saturdays.
Department Stores:

Odakyu Odakyu Department Store consists of 16 floors, including a wonderful food department in the basement and restaurant floors. The department store belongs to the Odakyu Group, which also operates a suburban railway line from Shinjuku to Odawara (Odakyu is an abbreviation for "Odawara Express").
Open daily from 10:00 to 20:00; restaurants from 11:00 to 22:00.

Keio Keio Department Store consists of 11 floors, including a food department in the basement and several restaurants on the restaurant floor. The department store belongs to the Keio Group, which also operates a suburban railway line from Shinjuku to western Tokyo.
Open daily from 10:00 to 20:00; restaurants from 11:00 to 22:00.

Lumine Lumine is owned by JR East and located next and above Shinjuku Station's South and East Exits. Lumine is divided into "Lumine 1" west of and "Lumine 2" east of the South Exit and "Lumine Est" (formerly known as "My City") above the East Exit.
Open daily from 11:00 to 22:00; restaurants until 23:00.

Mylord Mylord offers seven floors of shopping and three restaurant floors. The complex also includes "Mosaic Dori", a narrow pedestrian street between the Keio and Odakyu department stores. Mylord is affiliated with the Odakyu Group.
Open daily from 11:00 to 21:00; restaurants until 22:30.

Takashimaya Opened in 1996, the Shinjuku branch of Takashimaya consists of 15 floors, including a food department in the basement and three restaurant floors. A Tokyu Hands branch and Kinokuniya book store with a large foreign language section are located in the same building complex, also known as "Times Square".
Open daily from 10:00 to 20:00; restaurants from 11:00 to 23:00.

Isetan With a history of more than 100 years Isetan is a veteran among Shinjuku's department stores. The Shinjuku store is Isetan's flagship and consists of ten floors, including a food department in the basement and a restaurant floor.
Open daily from 11:00 to 22:00 (from 10:00 on weekends and holidays); Lumine Est from 10:30 to 21:30; restaurants from 11:00 to 23:00.

Flags Located next to the South Exit of Shinjuku Station, Flags is a ten-floor shopping complex featuring a Tower Records music store, an Oshman's sports goods store, a Gap and various other shops, cafes and an Italian restaurant.
Open daily from 11:00 to 22:00 (Tower Records and restaurant until 23:00).
Electronics Stores:

Yodobashi Camera Yodobashi Camera is one of Japan's leading discount electronics retailers, and especially strong on camera equipment. Yodobashi's main store is located near the west exit of Shinjuku Station, while a smaller branch is located near the station's east exit.
Open daily from 9:30 to 22:00.

Bic Camera Bic Camera is another of Japan's leading discount electronics retailers. Bic's main store is located in Ikebukuro, but it also operates two branches next to Shinjuku Station, one in the Odakyu Halc Building near the station's west exit and one east of the station near the Isetan department store.
Open daily from 10:00 to 21:00.

Sakuraya Sakuraya is the third of Shinjuku's three big discount electronics stores (besides Yodobashi and Bic, see above). Sakuraya has as many as nine locations around Shinjuku Station, two on the west side and seven on the east side.
Open daily from 10:00 to 21:30.
Parks:

Shinjuku Gyoen Shinjuku Gyoen is one of Tokyo's largest and most pleasant parks and best cherry blossom viewing spots. It was opened to the public in 1949, after it had served as a garden for the Imperial Family since 1903.
Open from 9:00 to 16:30. Closed on Mondays (Tuesday is Monday is a national holiday) from December 29 to January 3. There are no closure days during the cherry blossom season (late March to late April) and the Chrysanthemum Exhibition (first half of November). Admission is 200 Yen.

Central Park Kumano Shrine (Kumano Jinja) and the cardboard box houses of a sizable number of homeless people are located in this public park directly behind the Tokyo Metropolitan Government twin towers.
Always open, free admission.
Any advice or question? Voice them in the forum!
how to get there
Shinjuku Station is Japan's busiest railway station, served by about a dozen railway lines, including the JR Yamanote Line.
From Tokyo Station
The frequently departing, orange trains on the JR Chuo Line (Rapid Service) take less than 15 minutes and cost 190 Yen from Tokyo Station to Shinjuku Station.
From Ueno Station
By JR Yamanote Line it takes 25 minutes and costs 190 Yen to get from Ueno to Shinjuku. A slightly faster alternative is taking the JR Yamanote or JR Keihin-Tohoku Line from Ueno to Kanda Station, and then the JR Chuo Line from Kanda to Shinjuku.
Orientation in Tokyo
useful vocabulary

hotels & ryokan
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Fukuoka

Fukuoka is Kyushu's largest and one of Japan's ten most populated cities.
Because of its closeness to the Asian mainland (closer to Seoul than to Tokyo), Fukuoka has been an important harbor city for many centuries and was chosen by the Mongol invasion forces as their landing point in the 12th century.
Today's Fukuoka is the product of the fusion of two cities in the year 1889, when the port city of Hakata and the former castle town of Fukuoka were united into one city called Fukuoka. Hakata remains the name of Fukuoka's central district and main railway station.

Yokohama

With a population of over three million people, Yokohama is Japan's second largest city. It is located less than 30 minutes south of Tokyo by train, and is the capital city of Kanagawa Prefecture.
Towards the end of the Edo Period (1603-1867), during which Japan isolated herself from the rest of the world, Western nations forced the country to open its ports to foreign trade. In 1859, Yokohama's port became one of the first ports to be openend, and Yokohama quickly grew from a small fishing village into one of Japan's major cities.
Until today, the Yamate residential area retains a Western touch and houses many foreign residents, while Yokohama's Chinatown is one of the world's largest.

TOKYO

Tokyo is Japan's capital and the country's largest city.
Tokyo is also one of Japan's 47 prefectures, but is called a metropolis (to) rather than a prefecture (ken). The metropolis of Tokyo consists of 23 city wards (ku), 26 cities, 5 towns and 8 villages, including the Izu and Ogasawara Islands, several small Pacific Islands in the south of Japan's main island Honshu.
The 23 city wards (ku) are the center of Tokyo and make up about one third of the metropolis' area, while housing roughly eight of Tokyo's approximately twelve million residents.
Prior to 1868, Tokyo was known as Edo. A small castle town in the 16th century, Edo became Japan's political center in 1603 when Tokugawa Ieyasu established his feudal government there. A few decades later, Edo had grown into one of the world's most populous cities.
With the Meiji Restoration of 1868, the emperor and capital were moved from Kyoto to Edo, which was renamed Tokyo ("Eastern Capital"). Large parts of Tokyo were destroyed in the Great Kanto Earthquake of 1923 and in the air raids of 1945.

Hiroshima

Hiroshima is the capital of Hiroshima Prefecture and the largest city of the Chugoku Region, the westernmost region on Japan's main island of Honshu. It is home to about one million people.
On August 6, 1945, Hiroshima was chosen by US armed forces as the first ever target of an atomic bomb employed over a populated area. As a result, 200,000 civilians lost their lives, and Hiroshima became a city vehemently engaged in the promotion of peace.
Hiroshima's Peace Park including the memorial museum, and the island of Miyajima (literally: shrine island), located 40 minutes from the city center by train and ferry, are among Japan's most interesting tourist attractions.

Kobe

Kobe is the capital of Hyogo Prefecture and one of Japan's ten largest cities. Located between the sea and the Rokko mountain range, Kobe is also considered one of Japan's most attractive cities.
Kobe has been an important port city for many centuries. Kobe Port was one of the first Japanese ports to be opened to foreign trade in the late Edo Period, and the city remains one of Japan's more cosmopolitan cities.
In January 1995, Kobe was hit by the Great Hanshin-Awaji Earthquake, which killed over 5000 people and destroyed tens of thousands of buildings. A decade later, the city is completely rebuilt, and few signs of the terrible event are left.