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yes if i had the opportunity i would go travel.

and i would pick japan because it's a free country with a rich culture, people are friendly toward the foreigners. it has the most advanced metro in asia, and it also has the nature with high mountains. you get to see both concrete jungle and real forest. japanese manages to keep a nice mass transit system, there's just about subways in every metro city of various sizes. japanese also has a high fluency in english so it may be easier for non-japanese speakers to travel. don't worry about food, you won't get hungry, there's plenty of western style restaurants and food to choose if you can't get used to japanese food. accomodation is plentiful, mostly cleanly kept(japanese are a clean culture you know because they love to bath and hot springs). lots of entertainment, you will not get bored. japanese are highly educated most of them, crime rate is fairly low(the police don't carry guns).

china on the other hand is a massive piece of land there's a huge disparity between metro and rural area. unless you speak mandarin very well and is an experienced traveler china may not be a good choice for a novice and faint of heart.

good luck

Your first 3 worldwide places are certainly extremely decrease priced and you will possibly be able to stay somewhat great on that finances. yet when I have been on your shoes, i could combination it up somewhat - some luxurious, some finances, and keep somewhat greater for Japan - exceptionally in case you like sushi :-).