I stayed in Shinjuku on a trip to Japan a couple years ago. It's a really busy business and shopping district in Tokyo that's filled with tons of skyscrapers and buildings. Shinjuku is a really fun place to either stay or visit, because the architecture is just really amazing. All the buildings are fascinating to look at, and there is just a really great vibe. It is a really crowded area, and the streets are always filled with people; it's a great experience to be in Shinjuku.