Cenotes were one of our must sees during our trip. We visited two sites: Sac Aua near Valladolid and Los Tres Cenotes de Cuzama, not far from Merida. The second site was the one we wanted to see based on our guide book and the first was a recommendation from the concierge at our hotel in Valladolid.
Los Tres Cenotes de Cuzama is a series of three cenotes (duh) that all have their unique characteristics. One of them had no light (we had to turn on the electric lights when we got down there) so my pictures didn’t turn out well (I forgot to check if I had a nighttime option). Another had two or three bats flying overhead (M didn’t like that but I thought it was fun; the bats stayed completely out of range.
Honestly though, Sac Aua was my favorite. All the cenotes are underground and have beautiful turquoise water. But Sac Aua had this little island with trees and plants on it. It just had this magical hidden world quality to it that I loved.