Located 5km north of Playa las Calaveras (one hour by boat), Cayo Piedras del Norte has been made into a 'marine park' through the deliberate sinking of an assortment of vessels and aircraft in 15m to 30m of water, done during the late 1990s.

　　Scuttled for the benefit of divers and glass-bottom boat passengers are a towboat, a missile-launching gunboat (with missiles intact), an AN-24 airplane and the yacht Coral Negro.