Go to the heart of Tokyo's building complex. You can enter the South Observation Deck of the Tokyo Metropolitan Government Building until 9:30 p.m. (leave by 10:00 p.m.).
The city of Shinjuku is full of charm even at night. You can dine at restaurants on the upper floors of skyscrapers and hotels while gazing at the night view, or enjoy a nightcap at Shinjuku Golden Gai, where small bars are crammed together. The north side of Shinjuku Station is known as a fierce battleground for ramen lovers, and they should not miss this area. There are also many unique restaurants and izakayas in Shinjuku, where you can enjoy a variety of gourmet foods.

Ryogoku is a sacred place for sumo wrestlers. The Ryogoku Kokugikan also houses the Sumo Museum (until 16:00: last admission at 15:30), where you can enjoy the atmosphere of sumo even when not in the middle of a tournament. Enjoy meals unique to the area, such as "Edo Noren" at Ryogoku Station or a chanko-nabe restaurant owned by a former sumo wrestler.
If you want to watch sumo, be careful when you visit. (Sumo tournaments are held in January, May, and September.) Tickets must be purchased early. You can watch the matches in the morning, but many people enter around noon to walk around the building and have lunch, and many of the seats are filled by 3:00 p.m., when the makuuchi rikishi（high-class wrestlers） appear on stage. Watching a sumo match can be a special experience!

Kabukiza Theatre is not only a place to watch traditional Japanese Kabuki performances but also an attractive spot where you can purchase Japanese goods, sweets, and other items in the basement. There's also a rooftop garden featuring monuments related to Kabuki. Ginza, where the Kabukiza Theatre is located, is a world-famous shopping street, and on weekends, it's closed to traffic and open only to pedestrians. Enjoy strolling along the wide streets and visiting long-established department stores and commercial centers like GINZA SIX.

Finally, head to Shimokitazawa, where you can experience the traditional streetscapes and unique culture of secondhand clothing, literature, music, and more. If you walk a little from the station, you'll find the Shimokitazawa Ichibangai Shopping Street, lined with live music and theater venues, as well as vintage clothing and record stores. 
There is also the new commercial facility "Mikan Shimokitazawa" developed in the area around the station, where you can enjoy shopping and dining.
 And for dinner, why not try some curry? There are lots of curry shops in Shimokitazawa, so you might find your new favorite curry here.

Around a 5-minute walk from Akihabara Station, the about 100-year-old red brick-built Manseibashi Bridge has been transformed into a new tourist spot called "Marché Ecute Kanda Manseibashi". Not only can you take some great photos here, but there are also lots of cafes in the area, so it's a good place to take a break. After that, enjoy shopping in Akihabara, which is packed with all kinds of culture, from the latest technology trends to anime. You might even be able to get some rare items that you can only get here.