tokyo
Nishi-Shinjuku
Nishi-Shinjuku (literally West-Shinjuku) is a skyscraper business district west of the Shinjuku train station, in Tokyo.
Ryogoku
Ryogoku is a neighbourhood of Sumida City in Tokyo. It is considered the center of the professional sumo world, with the Kokugikan sumo arena and numerous sumo stables located in the area. Other places of interest include the Edo-Tokyo museum (photo above) and Yokoamicho Park.
Rainbow Bridge: Crossing Tokyo Bay on foot
The Rainbow Bridge is a 798-meter long bridge crossing Tokyo Bay between Shibaura and Odaiba. It is accessible to pedestrians and can be used to cross the Bay on foot, all the way to Odaiba.
Toyosu
Izu Oshima
Oshima is an island lying about 100 km south of Tokyo and is the largest of the Izu Islands, a group of volcanic islands administered by the Tokyo Metropolitan government. Like the other ones, it is accessible (among other options) by a high-speed jet ferry that uses the hydrofoil technique: It makes it possible to get there from Tokyo in a mere 1h45. Oshima offers various interesting activities: Among the most popular are the beaches (made of black sand), the onsens and the volcano (Mount Mihara). There are also a zoo, a large camellia garden and a squirrel park.
Tokyo from above: 12 skyscraper observatories
Tokyo has many skyscraper observatories open to the public. On a clear day, it is even possible to see Mount Fuji and a good part of Kanto. Here is a list of the ones I have visited so far. I have also made a map to show locations.