Not too hard if you are already in Blz. Just go to Chetumal on the Mx Border fill out all that garbage the MX immigration wants about your car ect. (Dont' even think about taking one you don't own in your name). Then proceed North to Correo Puerto then on N. to the big fine new highway past the Mexican Riverea on up to Cancun. What are you going to drive? Why not just drop down from texas like I have 5 times. Interesting trip but dont expect to make but about 300 or 400 miles a day. Most people don't drive at nite.
Bud