You could spend it on some personal grooming. You know, try and keep the ladies looking and whatnot. And what better way to start than with updating that stodgy old haircut. And the hip look in Tokyo these days is a sort of 60s-Shag revival:
Of course, not all styles are suited to all faces. Maybe something with a little less...wig is in order. How about the chappatsu look that's swept the nation.
And finally, like most hard-working acorn gatherers, you could spend that money on booze for a quick fix of fun!
Just don't get so drunk you forget whether or not skin outranks steel wire on the Mohs Hardness Scale.
Whoo-Hah!
