Aye man my family's from El Salvador and ive been there a couple of times and lived there for a couple of years. But if you want some good food try
PU-PU-SAS = They're like a tortilla but with pork or chicken or beans and melted cheese inside. With a side of tomato sauce and spicy curtido(cabbage,jalapeno's,carrots,and vinegar)
Another is Cu-zuco = its basically armadillo meat fried like pork.(really good)
Ga-rrobo = this one is iguana meat but man it taste just like chicken i've tried it in soup with potatoes and or with rice.
Mari-sca-da = a soup with all types of sea food shrimp, fish,crab,oysters,etc. really good for them late night activites
Theres alot more man...but if you head down to central america and most of latin america you should find most of the foods related to each other(tamales,soups,drinks) in one way or the other.