Where in the World is the Westwood Wildcat? Clue #4

Here's your last clue for the week!  My secret location will be shared with you tomorrow morning.  :) 

1. While I enjoyed my time in the Land Down Under, it’s time to head back to the Northern Hemisphere.

2. Some wildcats I know like to vacation on islands.  I prefer life on a peninsula.

3: My location is near 20N latitude and 88W longitude

4: Would you believe that the place I’m visiting was created by the Mayans in 600 AD?