How much money do you need to travel around japan - ? generally there is no need to buy japanese yen in your home country before your trip, as you will most likely pay a higher commission (about 3%) and a worse exchange rate than you would get at the airports, banks, or atms in japan. If you’re not into trying new foods and can stick to udon or ramen you can save a lot more money than i did, but if you want to try new things and enjoy some really awesome. If you buy your pass online you can save a lot more money than i did, but since i needed to purchase mine last minute (and in south korea) i bought a 21 day pass from a travel agency. Are passes for each city that could potentially save you money, but since i was bouncing from place to place and not staying in one city for 2-3 days most of them weren’t worth it to me.