Kenya is not the most disabled-friendly travel destination. Few places are wheelchair accessible, and sidewalks and roads are in such dilapidated condition that even those without disabilities can find them challenging. Nevertheless, safaris should not pose too much of a problem given that much of the time is spent in a vehicle, and you can choose one where accommodations are in tents or ground-floor rooms. Level-entry flat-floored showers, ramps, and grab handles do exist, but only in a few safari lodges and resorts. By doing a bit of research, most travelers with disabilities should be able to find an itinerary that suits their needs.
Access-Able Travel Source (www.access-able.com) offers extensive access information and advice for traveling around the world with disabilities. Accessible Journeys (www.disabilitytravel.com) caters specifically to slow walkers and wheelchair travelers and their families and friends; they organize safaris in Kenya to the more popular parks.