The Ol Donyo Sabuk National Park makes for a nice day trip from Nairobi, being located just 65 km from the city. The name refers to the solitary mountain standing in this park and rising to a height of 2,145m (about 8,000 ft). The park covers an area of around 20 square kilometers. The name is Masai and means "Mountain of Buffalo" - about 250 buffaloes can be found on the slopes today. The Kikuyu tribesmen call the mountain Kea-Njahe, or the "Mountain of the Big Rain", and consider it as one of the homes of the Supreme Being Ngai.

There is one camping site in the park. Visitors should approach the park via the lovely Fourteen Falls on the Chania River. The park offers great views of high mountains like Mt Kenya and Mt. Kilimanjaro. Visitors can reach the top of the solitary mountain in the park using 4X4 vehicles. The graves of Sir William Northrop Macmillan (1872-1925) and his wife Lady Lucie lie near the summit. The American had arrived in Kenya in 1901 for big game hunting, and had played host to Roosevelt during the latter's 1911 safari. The ranch "Juja Farm" where he hosted Roosevelt is popular among film crews. The couple are known for creating the Macmillan Library in central Nairobi. Visitors can also observe animals like the baboon, colobus, bushbuck, impala, and duiker and a variety of birds.