I toured Kenya for 10 days a month ago. I took my Nikon D7100 and rented another like it. My D7100 wore my 18-200VR2 lens and the rental wore my (recently purchased) Nikon 200-500mm lens. I kept my camera on its strap around my neck to be readily available and the rental with the big zoom was in my camera bag. When I was in the 4WD vehicle for a "game drive" I made that camera easily available. The driver generally gave us plenty of time to go between cameras when we stopped to view game. Both lenses (and cameras) had plenty of use, but the vast majority were done with the 18-200 lens. OTOH, some shots would not have been possible without the longer lens.

I'm still in the process of working PP with my photos, so am not able yet to post any. I'm also still undecided what organization I will use for posting to Flickr.

FWIW, I did do the hot-air balloon ride. It was great! Our pilot kept the balloon low so we had excellent views of the wildlife. Had a full breakfast in the field (with tablecloths and everything!) waiting for us when we landed.

One warning--plastic bags (including zip-lock) are forbidden in Kenya. You'll have to find some substitute for those.