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Photo: Reggaeman, CC BY-SA 3.0 via Wikimedia Commons
A temple most famous as the resting place of the 47 Rōnin, a famous group of samurai who banded together to avenge their unfairly slain master. Having obtained the head of the offender, they brought it to this very temple and then were condemned to commit ritual suicide, like their master. The story is told in Chūshingura, the best-known of all Kabuki plays. History aside, the temple isn't much to look at, but the small museum has artifacts from the event and after, including wooden statues of all the ronin, the banner that the ronin posted during their raid, original letters, and the receipt that the priests wrote out for the head. The graves are a popular site of pilgrimage to this day.
Sengaku-ji (泉岳寺) is a Buddhist temple belonging to the Sōtō school of Japanese Zen located in the Takanawa neighborhood of Minato-ku, near Sengakuji Station and Shinagawa Station, Tokyo, Japan. It was one of the three major Sōtō temples in Edo during the Tokugawa shogunate, and became famous through its connection with the Akō incident of the forty-seven Rōnin in the 18th century.
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アクアパーク品川
A popular aquarium with exhibits that combine dolphin shows and technology. The tunnel tank includes manta rays, green sawfish, and the only dwarf sawfish on display in the world.
自然教育園
A 200,000 sq m nature preserve in the heart of the city, with birds and waterfowl, insects and marine life.
東京都庭園美術館
Art museum housed in a classic Art Deco style structure, connected to a small park with Japanese and Western gardens and outdoor sculptures.
東京出入国在留管理局
This center serves foreign residents and long-term visitors. Also houses immigration detention. If going in the morning, get there early because a line forms outside long before opening hours.
増上寺
This grand old temple is the headquarters of the Jōdo-shū sect and houses the graves of 6 of the Tokugawa shoguns, but is a little off the beaten track and is rarely visited by tourists. Particularly beautiful around cherry blossom time. It hosts a variety of religious and non-religious festivals throughout the year.
東京タワー Tōkyō Tawā
This was a newly re-industrialized Japan's 1958 answer to Paris's Eiffel Tower — a bit more modern-looking and 9 m taller. Entry to the Main Observatory (150m) is ¥820, while ascending to the Special Observatory (250m) is an extra ¥600. Your photo will be taken for purchase later (¥600). Tip: To get a good view of, and picture with, the tower, try the courtyard in front of Zojoji (nearby), or the second-floor deck outside the Mori Tower at Roppongi Hills. (Some consider that there are better alternatives for views, including the Tokyo SkyTree tower Sumida ward which is twice as high, or the Shinjuku's Metropolitan Government Building observatory instead).