It's ok to raise your hand in a restaurant or call a server over. They expect that!
Typically you only need to tip $1-$2 cash. In most places they will not even have a space on your ticket for you to tip on a card. Although, sometimes tip is included - look for the word "propina."
**You cannot drink a single drink and then drive. If you have any alcohol on your breath while driving, you can get arrested. **
Google/Apple Maps don't work as well in El Salvador - use Waze
Salida = Exit
Entrada = Entrance