passport
To get a passport, first, you will have to fill out form DS-11. Now you will have to provide evidence that you are a U.S citizen by providing your birth certificate. You could also provide your old passport. Next, you will present your ID. Things like your drivers license etc. Submit any special circumstances such as children or lost passport. Provide a photo of yourself. Give calculation fees. Your final step, is just to submit your final application.
Travel advisory
The travel advisory for Japan is a level 1. This means it is very calm and there is no war. It is a safe place to visit. This doesn't surprise me because its last war was WW2 vs. the USA. It has been very peaceful ever since then.
exchange rates
1 United States dollar is worth 108.58 Japanese yens. So if you bought a new car for 36,000 USD (average price), then you would pay 3,909,346.88 JPY.
Tokyo is in Kanto.