Well, it is dead straight and crosses water over a wooden bridge to a small island. Could Brutus and Caesar have walked here? The Mayans wore sandals, helmets, carved statues out of stone and built amazing architectural masterpieces too!
Maybe not.
THE CACHE IS NOT AT THE ABOVE COORDINATES!
To find it you will have to decode the following
EHUDXCPMCLROVANKAJPMZCPYMPHXANW
The final is at
N21 1A.BCD W086 4E.FGH
There is space nearby to park off the busy road. Watch carefully where you walk as the path to the cache is uneven and rocky. Always take care! Not a good one for night caching.
Very few caches in Mexico last for long as there are eyes everywhere. Please be circumspect while finding and signing.
You can check your answers for this puzzle on GeoChecker.com.