Gratuities are not mandatory and never included, but if you've been pleased with the service, it's customary to show appreciation, and workers are very thankful. Generally speaking, gratuities can be 100€ full day guides, 50€ half/partial day guides, driver 75-150€ on full day use of vehicle, skipper 150-250€ for full day tours, hotel porters 3-5€ per bag, restaurants 10-20% on the total, guest ambassadors, based on service received, 1-5% on rhe total amount. Gratuities in Italy run anywhere from 10-25% depending on the services and your satisfaction with them.