Far more interesting and climb-able than Chichén Itzá, Uxmal is an extensive site full of intricate mosaics and curious decorations. And it even has a –shhh– hidden “Temple of Phalluses” (which we didn’t find because the path was so overgrown…but it’s there, somewhere…as are several stone phalluses which are readily on display beside said overgrown path). I loved Uxmal and would highly recommend it over Chichén Itzá. Bring snacks and water and plan to spend a good three hours here exploring all the structures (and maybe wandering down some secret pathways).
While it used to be an important port for the exportation of henequén rope, so much so that the place itself is named after said rope (sisal), Sisal is now just a sleepy fishing town. It took us over an hour just to find a place to stay, because everyone who rented rooms had “closed because of the bad weather” or “gone to the Sunday market.” We had some seafood at a restaurant right by the shore and spent the rest of the day wandering the beach. It was full of algea and horseshoe crab shells from a recent storm, but peaceful and pleasant.
If you’re going to go to several archeological sites in Mexico, Chichen Itzá is honestly not the best, mainly because it’s now prohibited to go into or on any of the structures, so you can only admire them from afar (which means you miss out on seeing a lot of carvings and decorations). Some large sites that do allow you to climb almost everywhere are Uxmal (also in Yucatán) and Palenque in Chiapas. But if you’re in Cancún and the only tour you can get is to Chichen Itzá, then take it! It’s still a cool site.