Isla's cemetery is on Avenida López Mateos, the road that runs parallel to Playa Norte. Many of the century-old gravestones are covered with carved angels and flowers, with the most elaborate and beautiful marking the graves of children. Hidden among them is the tomb of the notorious Fermín Mundaca de Marechaja, a 19th-century slave trader—often billed more glamorously as a pirate—who carved his own skull-and-crossbones gravestone with the ominous epitaph: "As you are, I once was; as I am, so shall you be." Ironically, his remains actually lie in Mérida, where he died. The monument is tough to find, so ask a local to point out the unidentified marker.
Av. Lopez Mateos, Isla Mujeres, Quintana Roo, 77400, Mexico