From Rim Tours FAQ

What about tipping?
The most common question that nobody likes to ask. Tipping is not required but is the customary way to express your thanks for a trip well done. The amount you should tip should be whatever you're comfortable with. If you liked your ride, tip your guide! It will be gratefully appreciated by our hard working staff. A tip of 10% to 20% of the cost of the tour is in the normal range. Remember to have cash on hand at the end of your tour for tipping.


Western Spirit added in that the amount was split between the guides not 10 - 20% per.

Veronica