After a long, hot day I especially appreciated the breeze from the bike and the shade in which the Coba ruins reside. And, I was charmed by the signs that clarified where I should leave my bike.
Climbing the large pyramid at Coba, I stopped at 3/4 of the way to the top to take this video:
From the top you can see the dense jungle covering the area. Many of the ruins (including the one I climbed) only have one or two sides cleaned of the plants overgrowing them. Scientists use GPS systems and photos from space to find the ruins, using the lighter color of plants growing over the limestone ruins as an indicator.
Going down is much more frightening than going up.
At one point on my way down, I smashed my finger between the security rope and rock steps...ouch!
Coba has at least two Mayan ballcourts, like this one, where elites used their hips to hit a rubber ball through the hoops at the side. The winners of the game were then given the honor of being sacrificed to escort the sun through the night and ensure it arose the next day.