Orrie,

I have travel to Mexico numerous times, Cancun and the Yucatán included. You can carry as much equipment as you want, but why would you. As a photographer who has travel and part of Nikon Professional Service I highly suggest you reconsider what you take with you. There's tons of great places to take photographs like Chichen Itza, Tulum, etc you can do that with one body and a all in one lens like a 28mm-300mm for the D750. You don't want to be carrying a lot of equipment when you climbing a Mayan pyramid in hot humid weather.

When I travel to another country for photography I usually carry 2 full frame bodies, 50mm, 16mm-35mm & 28mm-300mm.

Rob