Hi all. This is the kind of information one wants to share because it's so cool.
We travelled to Rio Lagartos by car from Valladolid. A must. We were there on a Sunday. The center park was packed of people. Kids playing around. Women selling food on temporary tables. The mass was on. An orchestra was doing a sound check. The mass ended and the dancing started, courtesy of the mayor. It was enchanting: the sun was setting, the church was lit, the music on.
As soon as we entered Rio Lagartos a scooter approached my window and asked if we wanted a tour to see the flamingos. We stopped and talked. As we wanted to hear other options to conclude what was a reasonable price to pay we asked for his phone number and said we would call later. When we got to the malecon, the street that goes along the coast, it's about a km long, Rio Lagartos is a small town. Somebody shouted "flamingo tour", so we stopped and opened our ears to Fidel. We closed the deal for the next morning at 7. He recommended a hotel called Mercy, so did the first guy, so we checked it out. The room was clean, it had air conditioning (not that I like air conditioning but it was sweaty hot, July), private bathroom, TV (just so you know), and a corner view to the water. I would recommend it.
At 7 Fidel arrived with the boat, a lancha, right in front of the hotel. And the tour began. We were lucky to start the day with the sight of a crocodile. Along the ride in the river amongst the mangroves Fidel pointed many kinds of birds. Flamingos appeared in the sky. Fidel slowed down to approach a group of flamingos while educating us on the awesome animal. He then took us to the Rio Lagarto's Dead Sea. It's enclosed water in a salt mine. The attraction here is to jump in and float. After this Fidel takes out clay from the bed of the river for you to cover yourself, all over. While the clay dries he takes you to a spring of fresh and clean water. This marks the end of the tour. It was an amazing experience and Fidel is a great guy.
Here is his number: +52 1 986 103 8467
I highly recommend him.