If you are into diving, crater diving in El Salvador is a must do. There is at least one great PADI dive center where they speak english as well as spanish and made our crater dive an amazing experience. This is a hidden spot that doesn't want to hide any more. The lagoon is beautiful, emerald green lake situated in the dormant crater of Tecapa Volcano in the department of Usulutan. The lake water is tepid, but is fed by boiling-hot water which seeps from the ground and collects in the crater.
Locals say that the sulfur-rich water is medicinal.
Also inside the crater is a primary growth forest teeming with wildlife including agoutis, ocelotes, coatis and an impressive number of birds. Above the forest and the lake rise 350 m cliff walls, partly covered in vegetation and partly bare rock. There are wonderful guides available to take tourists to the lake from Alegria or to show the way along the trail around the rim of the crater. Few foreign tourists come here because it is not listed in any guidebooks and on behalf of the community of Alegria, and the US Peace Corps, I invite you to visit this beautiful site. Don't miss it.