Telum tour was good with knowledgeable guide until all the herds of people arrived. Then we turned into one of the mindless rabble that infested Telum. Go early. Coba was short and sweet. Not super busy like Telum. Get the rickshaw bike for a fun ride to the ruins and the Coba pyramid. Cenote was fun. The snorkeling was terrible. Water was murky and the current was too strong. You had to work hard to get back to the boat after they dumped us in the water with zero instructions. No one could speak any English. They did it for the money and didnt really care about our safety or our experience. That was a huge disappointment.