Here is my opinion. Mexico would be dangerous for a solo for one reason only. If you get hurt you have no one to make sure you get out safe. I have lots of contacts who tell numerous stories of getting hit by cars, running into donkeys etc. etc. and several of them came close to dying. With that said, life is short, be safe.
'06 Beta RR 525 "Red KTM"
'02 GasGas EC 300..."The Smoke"
'10 KTM 990 ADV R "Brutus Beefcakes"