Having worked for an English language school in the U.K., I have been invited many many times by the Mexicans who have come and gone. I have never been to Central America, but places like Mexico and Costa Rica excite us (travelling-two) so much that we will eventually end up on the playa sipping on some cocktails or a Corona soon. It looks like you had a great time and we look forward to seeing what other adventures you have! :)