Many Americans have grown accustomed to ordering an Uber off of their phone to get around their local environments with ease. However, Tokyo is the only part of Japan with such an app, and the layout is much different. Rather than a ride sharing app, it is simply used to hail a taxi, which is safe but can be very expensive.
If you really want to efficiently get around the city of Tokyo, the public transit system is the way to go. The clean busses and trains can be accessed by a prepaid card bought at a vending machine, either Passmo or Suica, and can easily transport you to just about any corner of the city in a reasonable amount of time for an inexpensive price. Once on the train, Japanese passengers typically mind their own business, which can result in a mesmerizing experience for us Americans who are used to talking at mostly all opportunities to in public. This will lead to a great opportunity to experience authentic Japanese culture, which includes observing the crazy and colorful fashion that some dress themselves in. Luckily enough, these cards can even be used to shop at konbinis, the 24/7 Japanese supermarket.