With the car/bus/boat safaries covering the other parts of the park, the walk safari concentrates on the inner loop. Most (but not all) animals can be seen from the path. Most cages even have (partial) glass fencing to improve the view. In general there isone big loop around the park (but with lots of side-tracks).
The boat safari can be done in two direction. From the starting point (entrance) to the midway point (or back). The area coverred is more or less the same as the first part of the bus/car safari (see my other tips).
The bus safari takes almost the same route as the car safari. Except for the first part which is busses-only route. Including the explanations of the driver the trip is split into two part of 45 minutes each. At the reststop in the middle one can swith to the boat and/or walk safaries.