This is one of the best museums I've ever been to. Entrance costs MXN 210 (USD 12) and cards are accepted. Try to go during the week or if you go on a weekend try to be there early, as soon as they open. I saw long lines when I left at noon.

The museum was excellent. The only thing that made me sad is seeing all this display of ancient traditions and wondering how much the evil Spaniards destroyed.