Don't you think Shinjuku is a night town only? Shinjuku in the daytime is also exceptional. You would surely be surprised at such nature in such a big city. Shinjuku Gyoen Park is one of the best parks in Tokyo. The Royal family initially owned the park. However, the park was in public after World War Ⅱ was over. You can see the park amazingly because there are various gardens, such as Japanese, British, French, etc.
We could also introduce a high-end department store area, a gay area, and a shrine. Your licensed guide explains more.