02-12-2009, 07:26 PM
As far as drinking goes, you probably won't have a problem unless you go to a spendy nightclub, where they tend to be more strict. Most young Japanese have no ID, so it is hard to check.
The most expensive part of your trip will be the plane ride from Tokyo to Okinawa. Eliminate that and you will probably be able to stay at least another week.
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