I'm leaving for Japan in about 14 hours. I just came across a page that said they can refuse me entry if I can't prove that I'm able to support myself financially while I'm there.

I'll only be in Japan for two weeks. I have ryokan/minshuku rooms reserved for the whole time. I can easily support myself, but I'm wondering if anyone knows what constitutes proof for the nice gentlemen at immigration. I have three or four bank credit cards, and I was expecting to carry in about 50,000 yen in cash.

Does anyone know what will satisfy this requirement? Not looking for guesses, I can probably do that myself.