Tipping at lodges and camps is recommended if you are pleased with the service.
A minimum of US$ 10 for each guest per day is usually the recommended amount for your guide or ranger.
For the lodge or camp staff there is typically a communal tip box, which is shared amongst the staff members at the end of each month. As a rule of thumb you can tip the general staff around US$ 10 for each guest per day (this is excluding your guide's tip).
Tipping at restaurants is at your discretion and is generally 10 per cent of the bill amount.