There is not a big culture of tipping in Costa Rica, and Ticos rarely do it. A service charge of 10% is usually already included in restaurant bills, as well as the 13% sales tax levied on all goods and services. Most menus have two columns-one for the actual price of the dish, and the another for the price including tax. If service was really great, tip 5% more. As Americans, we usually over do it and try to make sure they get 15-20% tip if we get good service, which the service here is as a rule FABULOUS.