“Entertaining nightlife spot, good for sightseeing during the day”
I like Shinjuku, despite the crowds. Numerous times I have visited here and always had a good time. The square Enix restaurant, the government building, and the small streets packed with bars and restaurants make it a great place for a day of sightseeing or a late night drink.
The area of Kabukicho is interesting, but at the same time, it is the only area that lets Shinjuku down in my opinion. Otherwise Shinjuku is an amazing place, and almost a city in itself.
Shinjuku Station is of impressive size too, and it is easy to get lost; which isn't necessarily a bad thing.
At Golden Gai in Shinjuku, experience the atmosphere of Japan’s olden days