It is customary aboard all cruise ships worldwide to give a gratuity at the end of a cruise, providing, of course, you have received good service. Riviera Travel emphasise that the amount you give is entirely discretionary, and is then divided equally among the crew on board. Riviera Travel are often asked for guidance on the amount, and suggest between €5 and €10 per person per day.
Again at your discretion they recommend tipping your local guides and drivers at the end of each tour, for which you can use the following guidelines:
Local guides €2 per person, per day
Drivers €1 per person, per day
Should you also wish to give a gratuity to your Riviera Cruise Director and Tour Manager, this is also at your discretion.