Hi i'm not sure if this is the right place to put this, and apologies if it isnt, but Craig Bounds and Tamsin Jones are organising a ride through Kenyan game reserves and raising money for the born free foundation and David Sheldrick Wildlife Trust. This is a commercial offering as it includes the bike hire, guides, accomodation etc. it aint cheap but if you're interested here's the link:
http://www.blackdeserttraining.com/african-adventure-ride-nov-2013.html
http://www.blackdeserttraining.com/african-adventure-ride-nov-2013.html