I spent 7 hours sitting in Nairobi Kenya's's airport waiting on a 1/2 hour connecting flight to Killimajaro Intl. Airport last year so I could climb Mt. Kilimanjaro and go on safari in Tanzania (after spending a week in Bombay, India at an international conference). I did not leave the airport. I would reccommend going to the US State Dept website and getting any notifications for Kenya before I go blissfully into a foreign country.......especially in this area, right next to Somalia (recently taken over by Islamic Fundies). You might want to keep a low profile. Remember, the American Embassies here were bombed prior to 911.
Good luck.