Friday is the Día de Juan Santamaría, which marks the 1856 Battle of Rivas in which Costa Rican troops defeated Nicaraguan and U.S. filibusters. Juan Santamaría distinguished himself by carrying a torch and igniting an enemy strong point. The effort cost him his life.
The day is a legal holiday, and most government offices will be closed, as will embassies.
Many government offices are closing Friday and will not reopen until April 21, the Monday after Easter. That includes the Ministerio de Comercio Exterior and the Registro Nacional.
Semana Santa, which begins Monday, is either a perfect vacation time or a period of religious reflection. April 17 and 18 also are legal holidays. Nearly every Christian church has some form of Easter observance. In the city, there will be processions most days with the big one being the burial of Jesus the afternoon of Friday, April 18. This is a major tourist attraction.