Hi, InquisitiveInHalifax--
We have never spoken, although I have read some of your posts before.
Are you flying or driving? Renting a car? That would make a difference in where you might visit.
I am guessing that you will be visiting the Yucatan, right? Have you heard of Villahermosa? The LaVenta and Tabasco Museums are there, I think, and there are lots of Olmec carvings and other archaeological collections that date to the Mayans and Toltecs. (Some of this information may be outdated, so be sure and check first.)
If you are driving down through Texas, let me know--I can be of much more help in that respect! And I know a little about the border towns.
Anyway, I just thought this was a good opportunity to say, "Nice to meet you."

And I hope you have a great trip!
InPeace,
InLove