Travel Routes
Here are some suggested travel routes for a week's trip to the Yucatán Peninsula

Cancun to the wedding location and back:

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Cancun to the wedding, then Campeche and back via Mérida:

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This is our route from our first trip to the Yucatán.

Cancun to Belize City: 

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Note - if you are planning to head to Belize City, you should plan to drop off any rental cars in Chetumal and catch a bus over the border.