I have learned a lot of Mexican Spanish today as follows: The statement that the one and only ADO bus back from Cobá is 'completo' and there is no other option to return than 'solo taxi' means that 'you could buy your ticket back on the spot even 10 minutes after the official start time of the bus'.
Otherwise the place was nice, fully covered by jungle, that still amaze me. The diversity of forms and unknown trees, that happily grow on the side or even the top of the ancient buildings. The never-seen-before animals that let you fairly close. A handful of rusty and yellow birds hunting for ants just under our nose. Iguanas, that have two 'mode': sneaking (lopakodó) and turbo (csörtetô). Usually they use the sneaking mode: moving slowly and prudentially with them belly slipping on the ground. But if they are frightened or just in hurry to a date than they switch to turbo mode: elevate them belly from the ground and start to run more fast than elegantly.
It was a bit disappointing for me that it was not allowed to enter the buildings or climb the pyramids except of the highest one. But that one was a stunning experience to see the vast jungle from the top. I just imagined how gorgeous could be a sunset or sunrise from there.