A breeze off the Caribbean pulls salt and light over low limestone cliffs as you approach the Tulum archaeological site—stone buildings keeping a quiet watch over the turquoise shelf below. The day moves from shore to sea: a short walk onto a panga and you’re drifting across a reef crowded with parrotfish, angelfish, and the slow glide of rays; visibility here can feel like looking through polished glass. Later, the forest closes in, and the cenote waits—cool, echoing, carved by water through Yucatán’s porous limestone into caverns hung with stalactites and supported by stalagmites.