Watch out in Japan for girls trying to pass off as Japanese. Also, don't open your mouth when a Nigerian approaches you or you will hear an earful for several blocks. Almost had to threaten him and his buddies to get them off my back as they try to lure you into some crappy bars/clubs.
In Hong Kong, those 141 walk-ups I've had some of the most crazy $50 experiences with some hot girls you would have here for 3-4 times the price.
Hard to find beautiful japanese whores as they are Yakuza controlled for the exclusive enjoyment and tastes of Japanese guys so that they are not foreigners friendly at all. Some Chinese and Korean sexworkers try to play themselves off as Japanese. Japanese women who are not whores are often lonely and dying to fuck a foreigner. These non pros often hate Japanese men so why pay to monger in Japan when it just might be free. If your trip is short though you might not have time to get into lonely neglected Japanese civilian pussy.