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>>827465
>visit many onsens
May I recommend Suginoi hotel in Beppu and the JR hotel in Oita.
>>827516
That first image is way out of date. Japan was like that, about twenty years ago. First, there are ATMs in every convenience store and post office now; the post office ATMs are more likely to be compatible with a foreign debit card, but you should call your provider now to inform them you intended to use your card abroad before they abruptly suspend it for suspicion of fraud. Second, the whole world uses the same cellular technology these days, but international data roaming will cost you; I recommend sticking to WiFi. Third, don't bring any electronics that have to be plugged in to operate: the sockets are deceptively different (two small prongs, not one big and one small; those plugs will not fit, and no ground, btw), the voltage is low (US 110/220, JP 100/200, and different parts of the country operate on different AC frequencies. Many a tourist has been disappointed to find the special adapter they bought just for the trip failed to power their American hair dryer; odds are your hotel room provides one anyway. Fourth, nose blowing is not "extremely rude"; it is mildly disgusting, somewhat more than a loud burp and somewhat less than a fart. You may blow your nose in public and social settings so long as you make an effort to turn your face away from others and excuse yourself.
I am so excited that you will be here for Golden Week! I wonder if we will cross paths? It's unlikely, and we wouldn't recognize each other anyway, but it's fascinating to speculate.