Kenya provides a lot of rewarding cycling. The rewards are very different from those to be had on the more familiar van safari to the game parks. It will take several months to see it all. Outside of the cities the traffic volumes are generally low enough so the drivers can easily be courteous, and usually are. While the general condition of roads are fair to good in rural areas, they tend to be narrow, congested and in neglected condition in built up areas.
Kenyan roads have an earned reputations for being particularly deadly at night respect it.
Even if you are in good shape for sea level, don't be surprise if you feel lethargic and you legs feel like lead weights for the first couple of days. Of course with there are also hills. On the main roads most of the grades are pretty mild, though sometimes several miles long there are of course exception. Off the paved road rain can create major problems. When wet the soil in Kenya seems to take on one of two characteristics.