Everyone spoke Spanish for tourists, but for the most part it was not the primary language people spoke.
I was quite surprised at how completely Mayan the culture was. I had expected it to have been completely subsumed by Spanish Catholicism over the centuries, but there is a substrate of the old religion and rituals everywhere, even in supposedly catholic festivals.
The impression you have from casual knowledge of the history is that Mayans used to be in Central America and then the Spanish came and they all died out, but that is far from the case. It’s a culture that is very much still alive.
If this interests you, I highly recommend visiting Guatemala. Book a flight to Guatemala City, take a bus to Antigua and from there you can find buses that go all throughout the Mayan highlands — lake atitlan, xela, Tikal. It’s a beautiful country with beautiful people and not at all what you would expect from the way people talk about it.