quick tips about Japan

Since I spent much time planning on Japan trip, here are some high level tips:

• googlemaps is a great way to find directions as it is well integrated with the schedule of public transit (local trains, subways, bullet trains), 
• but if you want more options (more alternative routes, or avoid certain railways), Hyperdia is very helpful: http://www.hyperdia.com/en/
• bring enough cash, as it is more common to pay in cash on restaurants, convenience stores, and train tickets.
•  Though credit cards are accepted in various restaurants, it is still a good idea to bring cash so that you can eat anywhere (especially Ramen, where you usually have to pay at a "order machine"). For shopping, credit cards are fine.
• get internet, either SIM card or pocket wifi. 
• There are many companies that offer affordable prepaid SIM cards for tourists (e.g. $20 for 8 days). 
• It is almost essential to have internet if you want to find directions or use google translate. Saves time, and it is convenient.
• Note that SIM cards provide only data, and no phone number (you have to be a Japanese resident), so you might want to have a skype account with money on it to make calls for any emergency.
• if you are travelling various cities, consider getting JR (Japan Railways) Pass. The basic pass allows you to travel in JR which owns the bullet trains unlimited within 7 days. I used it to travel Osaka-Hiroshima (with stops at Kobe and Himeji), Osaka-Kyoto various times, Osaka-Tokyo, so it was definitely worth it for me. Plus, you can use it for some local train lines.
• when you are not using the JR pass (e.g. taking a local non-JR train, subway), get an IC card (equivalent of "Octopus Card" in HK) so that you can enter and exit faster (not having to buy a ticket every single time)
• ask for English menu on restaurants. Probably one of the harder things is to order food since English is limited there, but most places have an English menu (eigo no menyu), so ask for one! 
• Tax free shopping, on some larger clothing, electronics, or department stores, you can avoid paying the 8% tax if you show your passport (foreigner). You will usually need to purchase more than 10,000 yen worth of goods, which can be easy for some people, but hard for others. So if you are travelling with others, combine them into one bill.
• Accommodations choice and location are important. Airbnb is usually a good choice in Japan as the places are clean and well maintained. In terms of location, it is good to be closer to a convenient train station, so that you can save time travelling and as well get back to the airport with ease.