Are you familiar with the CA-4 agreement between Guatemala, Honduras, Nicaragua and El Salvador?

The Central American Free Mobility Agreement (CA-4) is an agreement between the countries of Guatemala, Honduras, Nicaragua and El Salvador. According to this agreement, if you are a citizen of one of these countries, you will only need a national identity document (DPI) to travel to these countries. For minors, a valid passport and the company of a parent is required.