(Shinjuku West Exit)
The name derives from the Shinjuku Station. This is more or less a shopping, business district, and drinking area. The station gives you reasonably quick, but not direct, access to 歌舞伎町 Kabukichō, a red light district famous for drinking and whoring. There are a few temples and cemeteries in the area, but nothing particularly famous. If gritty Shōwa Era yaki tori shops are your thing, you might want to check out 思い出横丁 Omoide Yokochō which translates as something like “Memory Lane.” It’s a series of alleys with tiny, cramped specialty shops that offer yaki tori, ramen, sushi, and a few other dishes at reasonable prices. The streets might be old and dirty, but the shops are sanitary and the atmosphere is thick – definitely worth a visit at night. The Omoide Yokochō area has an English website.
Oh, and just a heads up. Shinjuku was on the outskirts of Edo. It was more of a post town than part of the capital proper. The name actually means “new post town” and refers to the creation of a new station that serviced the 甲州街道 Kōshū Kaidō Kōshū Highway and the 青梅街道 Ōme Kaidō Ōme Highway. Post towns were notorious for catering to the prurient proclivities of horny travelers. If you’re curious about Shinjuku’s NSFW origins, check out my article What does Shinjuku mean?