If you wan't 101% chances of seeing chimps in a wild setting without having to go through the trouble of hiking, Ngamba Chimpanzee Sanctuary will make your dream come true. It is a Island in Lake Victoria where the endangered chimpanzees are rehabilitated and looked after, primarily for pro-conservation purposes.
At present, this fully fledged resort destination has 50 chimps, 48 of which had been rescued from different parts of Africa where they were being poached or traded. The other two are babies which were born here over the last four years.
The island covers 100 acres of which 5% is developed with hospitality tourism facilities like restaurant, premium lodging, craft shop, beaches, shelter for the chimps and a clinic where they are nursed whenever they sustain injuries as a result of fights among themselves. The other 95 acres is made of a tropical forest where the chimps play and treat themselves to edible vegetation. In between these two settings, there is a raised platform that doubles as a vantage point from which the chimps can be viewed during their feeding times. From here, you will have unobstructed views of at least 22 chimps as you observe their wild ways of life. A female and baby might be in the tree, and about 12 males younger males on the ground.
The alpha male often defends the females from the other males, who are fond of sneaking up on them frequently. On finding them, the females start screeching and running through the trees. Then the rest of the forest then starts screaming.
Ngamba is currently ranked as Africa's Best Chimpanzee Sanctuary by Dr. Jane Goodall. This is mostly based on the fact that its staff are truly passionate about primate conservation and know each chimp by its name. Thanks to the chemistry they developed with them, they are able to satisfactorily answer all questions.
Best time to visit, anytime of the year. The Island is 45 minutes boat ride from Entebbe Airport.