You will be need to ride Day and Night. You can make Cancun in a Week riding in Daylight Hours and not stopping except for gas, as the roads even through Mexico are fairly straight and fast. Coming up the West side however, you start to travel through the mountains and it gets to be a lot more fun, but expect to average 50 KMH on some days. And that is scrapping your pegs on most curves. If I had to choose betwee the west side and the east side, it would be goodbye Cancun, hello Puerto Vallarta.
LenD Winnipeg Canada.