Photo: David Monniaux, CC BY-SA 3.0 via Wikimedia Commons
A controversial shrine to Japan's war dead, housing the souls of some 2.5 million people killed in Japan's wars — including convicted war criminals executed by the Allies. A favorite haunt of right-wing groups in black loudspeaker-equipped trucks, and often visited by Japanese and Taiwanese politicians, drawing sharp criticisms from neighbors China and South Korea in the process. Consider keeping your visit to the shrine secret if you have Chinese or Korean friends or relatives. Open daily and free entrance adjacent to Metro Hanzomon line Kudanshita station, or cross the bridge north from Kitanomaru Park. Festivals take place most notably in mid-July and mid-October, which can attract as many people and vendors as it does on New Year's Day when the Japanese come to pray for a prosperous year. It can also get quite crowded during cherry blossom season.
Yasukuni Shrine is a Shinto shrine located in Chiyoda, Tokyo. It was founded by Emperor Meiji in June 1869 and commemorates those who died in service of Japan, from the Boshin War of 1868–1869, to the two Sino-Japanese Wars, 1894–1895 and 1937–1945 respectively, and the First Indochina War of 1946–1954. The shrine's purpose has been expanded over the years to include those who died in the wars involving Japan spanning from the entire Meiji and Taishō periods, and the earlier part of the Shōwa period.
© OpenStreetMap contributors
遊就館
An odd collection of military paraphernalia (including human torpedoes and letters from kamikaze pilots) and one-sided (allegedly revisionist according to the Chinese, Koreans and other Asian countries except Taiwan) descriptions of Imperial Japan and World War II, but it can be pretty confronting at times. The museum includes a small military history book and model shop.
千鳥ヶ淵
One of, if not the most prominent cherry blossom site in Tokyo, and attracts throngs of people in its March-to-April peak season. It is located just across the street from Yasukuni-shrine. Rowboats are also available for one to row along a limited portion of the moat at ¥500 for 30 minutes, ¥1000 for an hour and at a slightly more expensive rate during cherry blossom periods.
北の丸公園, kita-no-maru kōen
Connected to the East Gardens on the north side is this park. Offering much of the same, it is a convenient way to get to Yasukuni Shrine. The park also houses the Nippon Budōkan (日本武道館), which regularly stages martial arts competitions and live concerts, as well as the Kagaku Gijyutsukan (科学技術館, Science museum).
東京国立近代美術館, Tōkyō Kokuritsu Kindai Bijutsukan
With a modest permanent collection on display and regularly changing exhibitions, MOMAT is a nice place to kill a couple of hours after you've seen the Imperial Palace across the road. Entry to the nearby Crafts Gallery is included in the price.
国立劇場, Kokuritsu Gekijō
For those interested in theatre arts, the Kokuritsu Gekijyo holds performances in traditional arts ranging from Kabuki, Noh drama, Bunraku puppet theatre, etc. You may want to check the schedule and make a reservation beforehand.
Kept in impeccable shape, the gardens of the Imperial Palace are particularly beautiful during the March and April plum and cherry blossom seasons. During the Edo period, this was the heart of the Shogun's castle, and you can see the tenshudai, the raised platform where the tenshukaku (main keep) was once located, and an open field that was once the site of the honmaru goten, the Shogun's main residential palace. Entrance is free through a number of gates; you will be given a plastic entrance card at the gate, which you are obliged to return upon leaving; most visitors use the Ōte-mon (大手門) gate near the Ōtemachi subway station (exit C10). Also an easy walking distance from Tokyo station.