Shinjuku (新宿) is a central ward of Tokyo, known as the metropolis' second center (副都心, fukutoshin). The area surrounding Shinjuku Station is a huge business, commercial, and entertainment center located atop the world's busiest railway station complex.
11 Naitocho, Shinjuku, Tokyo Prefecture 160-0014, Japan
Shinjuku Gyoen (新宿御苑) is one of Tokyo's largest and most popular parks. Located just a short walk from Shinjuku Station, the paid park's spacious lawns, meandering walking paths and tranquil scenery provide a relaxing escape from the busy urban center around it.
Spa LaQua is an onsen in the middle of Tokyo Dome City. They have multiple mineral pools, some with jets. There is a steam room, places to eat, get a massage, have your nails done, watch TV, and sleep. It is a great day spa. Massage, nails, and food are additional costs.