Pemi , get an AAA paper folding map of Mexico , even if you are relying totally on some thing electronic.The AAA map is really adequate detail for your plannning
On the map select and mark out your GENERAL desired path , This cannot be done as effectively on those little electronic srceens.You want theBIG PICTURE folde out in front of you. .
Now decide which highways fit your wishes and do this by also keeping in mind current WEATHER situations in Mexico.
As it is cooling off into winter there you may find that theGulf coast plain area has some grey rainy weather ( dirty pavement, drab scenery in the wet) which can run up into the eastern mountains.
So pick two ways to go, maybe down the east coast area and one farther inland and west of the mountains in the higher ,usually drier but colder interior desert
If you cross at Matamoros you could go as far as SAn Fernando for the night where you decide your next stage depending on TV weather reports. Do not worry too much about the bad news you have read in US sensationalist press.Just ride only during daylight- horses and cattle , broken vehicles and potholes on the roads are the real concerns y'know
If the coast zone looks as if weather is goung to be nice then you head south to Tampico,
If the Gulf plains are suffering with dreary wet weather brought by a cold front then head southwest to Cd Victoria on Mex 101 and follow that road up over the scenic mountains out of the city. This gets you hopeflly on the dry sunny side of the mountains to Jaumave
Take each day in this fashion, establish where the nice weather is on possible roads for you and plug away at it
If all of eastern Mexico is enjoying clear weather then consider taking any highway like Mex 85 south or Mex 105 from theTampico area.
These bothe travel up through great scenery, valleys , and onto the interior high country.
Mex 85 from Pahuca south a bit turn off to see TEOTIHUACAN,
See the smoking volcano Popo , head down to Oaxaca on Mex 190 ...
but there are so many choices for you to make .
Back down to Mex 180 around Veracruz or Acayucan and east to Palenque.More choices to make .
"Do I do the Tucatan Peninsula loop ? Uxmal ,Merida, Chichen Itza ,Cancun Tulum before heading into Belize...."