What to do with too much leftover yen?

I have about 10k in yen left. Found it at the bottom of my bag. I fly out later today. Going to try and use it for brunch but I anticipate still having a bunch left.

Would it be better to convert it to USD at the airport in Japan or at the banks back in the states.

Anyone have any nice airport suggestions for shops and souvenirs. Toward the realm of purses, jewelry, or anime themed. I’ve already got the basic souvenirs but since I have the cash to burn. I figure why not try.

by xHey_All_You_Peoplex