I had the same problem but in a different place. We went to crococun zoo and I was giving the tour guide and education on all the animals that were on display. He told me that I should be working in a zoo or start my own. It's touch and go when you get a tour guide. Also, when we went to Chitzen Itza the guide told us that the Winners of the ball game were the ones sacrificed and ever where in the States say the losers were, which is right, i can see both side working but would like to know which.
Next trip, ill do the study myself and go guideless.