MEX1K- You mentioned that you went to Cuba from Mexico. I too am a US Citizen living in Mexico and have been keeping a trip to Cuba in the back of my mind. Did you find any cheap airfares? So far the cheapest I have seen have been in the $300 range with a stop in Cancún.
Also, what was your money plan? Did you use Am Ex travellers cheques drawn on a Mexican bank?
Saludos.
Lesley