Must have passed you in the courtyard as I was there also in the mid 80s - late spring - early summer of ‘85 I think. Did you see the panels (carved before the Spanish arrived) of the jungle animals which includes one which looks very much like a horse or a donkey?
I did! Did you climb to the top of the pyramid? I did!
I was also amazed at how much TRASH there was strewn around, and how the pyramid(s) were covered in graffiti!
It’s a National Park, fer Pete’s Sake! But also, Mexico. :(