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Photo: Kakidai, CC BY-SA 3.0 via Wikimedia Commons
A large public garden, and one of the most popular places for viewing cherry blossoms in spring. It has Japanese, English and French gardens, as well as a Taiwanese teahouse and a greenhouse. The entrance fee often makes the park surprisingly uncrowded and peaceful. Admission ends 30 minutes before closing.
Shinjuku Gyo-en or Shinjuku Gyoen National Garden is a large public garden in Shinjuku and Shibuya, Tokyo, Japan. Originally a residence of the Naitō family in the Edo period, it later became a garden under the management of Japan Imperial Household Agency and is now a national garden under the jurisdiction of the Ministry of the Environment.
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東京おもちゃ美術館 Tokyo omocha bijutsukan
An old school filled with toys and fun small houses. Accompanying adults won't get bored, thanks to the variety of toys.
消防博物館
Three fire-fighting helicopters, ten trucks, and 3 floors of exhibitions. Very popular with kids, who can wear fire-fighting clothes and ride some of the helicopters and trucks.
東京四谷総鎮守 須賀神社
It is a shrine located around Shinjuku. It is a small shrine, but the stairs in front of it are famous as the background in the animated movie Your Name.
It is perfectly safe to walk around here during the day and marvel at the photo billboards of various male and female escorts on offer as well as the live gangster-types acting shady. While it probably shouldn't be done with children, for adults the result is far more "cultural interest" than sleaze.
シネマート新宿
335 seats total. Mondays are Men's Days, when men can watch movies for ¥1000. Wednesdays are Ladies' Days, when ladies can watch movies for only ¥1000.