On bills in restaurants and bars, there is usually 15% VAT and 10% service added, but if you are happy with the service, it is customary to leave a tip as well. Tipping in hotels and restaurants that you come back to has another purpose. It makes staff much more considerate. Tips are not only a nice extra; they are an essential supplement to a low wage.
The bus driver and his assistant will expect a tip for the fortnight they have driven around the group, so long as they have done well. A guideline for the bus driver and his assistant together is € 1 a day for the two of them. For the local travel guide we recommend € 1 per participant per day.