I have been to Cancun 3 times already and done trips to Playa del carmen, Chichen Itza, Isla Mujeres, Xcaret and much more. I am thinking of going to Cancun during Christmas of this year 2021, I am thinking of doing a possible 1 day trip to tulum. I am wondering if someone or a local knows if places like the archeological sites or other places in Tulum do close on Christmas day. What I would like to do is possibly take the ADO bus for the 2 hour trip. Any info would help.

Thanks,

Tulum ruins as well as the other archeological sites are normally open 365 days per year. This year with the pandemic, who knows? The entrance hours are presently shortened to 9-3 (they close at 4pm but last entrance is at 3pm) from their normal 8-5.
I personally find Coba a more interesting ruin but Tulum is easy to visit.