The Ngong Hills rise to the south-west of Nairobi, a ridge of four rounded summits at 2,460m — high enough to be cool and often misty in the afternoons. The hills mark the eastern edge of the Great Rift Valley; from the ridge you can look one way across the Rift Valley and the other back over Nairobi and the plains beyond.
A walking trail runs along the ridge between the four peaks, a route of about 8 km that can be done in a half day. Kenya Wildlife Service rangers accompany walkers for a modest fee, which is advisable given that the hills were historically unsafe for solo walkers — the trail is now patrolled and incidents are rare, but a ranger escort remains recommended practice.
The hills are about 25 km from downtown Nairobi. Buses run from Ngong town at the base; taxis are straightforward. Mornings are clearest, before cloud builds on the ridge.