I was very impressed with Coba...more so than Tulum. I wish we had dedicated more time. It's very expansive...too much to see in just a couple of hours. I climbed the pyramid (you're not allowed to climb most of the other Mayan sites). In a word...spectacular! The way up isn't too bad but coming down is not for the faint hearted. Muster up the courage because the view at the top is indescribable. My only complaint is the lack of signs describing the various structures. In hind sight in wish I had ponied up the extra $50 and hired one of the on site guides. As soon as I got near some wifi I read as much as I could find about this fascinating place. This is a don't miss excursion.