I'm setting out on an exterme adventure this next year to help orphaned children in South Africa. I'm trying to get the word out to runners all over the country. Check out my blog at http://www.52beginnings.com
If you haven't already, you should get in touch with Dane Rauschenberg, who did the same in 2006. He also financed his entire trip. I know that one problem he had was finding an official race around the holidays... so he had to become RD for his own. Good luck!
I do today what you won't, so tomorrow I do what you can't.