East Africa
Mountain gorilla trekking in Bwindi, chimpanzee tracking, and the source of the Nile.
Bwindi Impenetrable Forest — permits are limited, book well ahead.
Kibale National Park has one of the highest primate densities in Africa.
3–4 days built around a single trekking permit.
Reasonably — treks range from 1 to 6+ hours through dense forest terrain.