El Salvador has 23 volcanoes. Some of the make a terrific hike. El Boquerón is the second widest crater in the country and the walk around its rim is a great and pleasant hike, on the Westernmost limit from San Salvador.
Is a nice hike through cloud forest on an average elevation of 1,830 meters and great views. The terrain is mostly, not to difficult and mostly shaded.
Other hikes at Ecoparque El Espino, on the slopes of the volcano, also available.
Distance from airport (one way): 58 Km.
Walk length: 7 Km.
Check detailed data of the walk here