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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.
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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.
新宿御苑
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.
明治神宮野球場
Known as Jingu Stadium. Can see university and professional baseball games. It is also famous for being a stadium for the Tokyo qualifying round of the National High School Baseball Tournament.
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.