While anchored in Bahia San Padro and waiting for a weather window to head south, I noticed a rock arch in the hills above the bay (circled in red).
Asking the locals, I am told it is called “Big Trunk Elephant” (“Elefante de Trompa Grande”). It took about two hours to hike to the arch, first through washes to the base and then bushwhacking to the arch itself. Once there, I discovered the rock to be loose and dangerous to climb. Also, it appeared that rock climbing would be needed to actually get to the hole. Perhaps the backside would be more accessible.