Ol Pejeta in Laikipia is the largest black rhino sanctuary in East Africa, and it is where the last two northern white rhinos on earth live. Najin and Fatu are both female, both guarded around the clock, and when they are gone the subspecies is gone with them. Baraka, a blind black rhino, can be approached and fed under supervision, and the conservancy also runs the only chimpanzee sanctuary in Kenya, caring for animals rescued from the trade in West and Central Africa.
Beyond that it holds the big five across open plains with Mount Kenya standing to the east, and it is genuinely well regarded for the way it runs conservation, cattle ranching and community work on the same ground. Be honest with yourself about the driving: it is roughly three and a half hours each way, so this is a long day and an early start is not optional. Conservancy fees, transfers, drinking water and a professional guide are included.