You could loan it out over Kiva, or at least a part of it. Just be sure whatever you choose, for any of your investments, that they at least beat the rate of inflation, else you are better of spending it.
Kiva does not even pay interest, so I don't see how this fits the description of a potentially high-risk investment with the possibility for a large payout.
I lend on Kiva, and I don't have a problem with it. There's a lot that has to happen between my Paypal transfer to Kiva and the money being distributed to the local entrepreneur...and even more that has to happen to collect the payments.
I'm happy to set aside a small amount of money as a catalyst for progress, and thankful that others are doing the heavy lifting.
(Apologies for continuing this off-topic line of conversation.)