Not all buses accept IC cards, so be sure to check for the IC symbol at the bus stop or at the entrance of the bus when getting on. If there is no IC symbol, you will need to pay in cash. Luckily, most buses have easy-to-use exchange machines.
Please do not occupy a seat with your luggage. Please set your mobile phone to silent mode and refrain from talking on the phone. Smoking is prohibited inside the bus.
There is a custom in Japan where most people do not eat food outside other than when in restaurants. However, when using the bullet train or the green car, you are permitted to eat food. Normal trains and people commuting using said trains do not permit the consumption of food whilst riding the train.
So, can you travel in Japan without speaking Japanese? Sure you can. In big cities and at major landmarks and popular tourist sights, you'll be just fine most of the time. Of course, once you get off the beaten path a bit, things will get a little more challenging.
A Few Final Notes and LinksWhile credit cards are become more widely accepted in Japan, cash is still king in Japan. Don't assume that you can use a credit card in small stores, restaurants and accommodations, particularly “mom and pop” places. Always carry sufficient Japanese cash as a backup.
People who live in Okinawa, Japan have a wise strategy when it comes to maintaining a healthy weight. They call it “hara hachi bu”, which means to stop eating when you are 80% full. Studies show that cutting back on calories can lead to better heart health, longevity, and weight loss.