Cenote

The literal translation of Chichen Itza is like city for the water sorcerer clan.  On the tour guide it describes the cenote as a sinkhole, but in reality the water sorcerers is because of the cenotes, and this big established city is possible because of the cenotes.

In addition, sinkhole is perhaps less apt than tropical lagoon.  This thing was like swimming pool size, and went like 50 metres down at all times. 

Tropical plants grew all around it, and because they are formed by the top collapsing in, the pool was in like a pit, and then the tropical plants are trying to grow into it from above, so slender roots and ferns are dangling down , some almost touching the surface of the water.

The water also drips down in various droplets and tiny waterfalls, and they've built this whole resort around the place.

We plunged in, the water cool but not cold, sweet to the taste, limestone cave walls reaching up above us, and you can float on your back and see the sunlight through the leaves, the water dripping down, the glimmering foliage. 

The view up a part of my land, the lagoon itself a secret all its own.  People leaping in from the top of stairs, because it goes down for ages, no worries about the bottom.  We swam to all sides and declared it romantic enough for Valentine's and the best thing we'd seen yet.