You might want to exit SCdLC to the east and take in Palenque and the waterfall at Misol Ha park. The trail down to Agua Azul is steep, and a struggle. Then parking problems then worries about petty crime.
Myself I cannot afford the Caribbean coast of Quintana Roo on Yucatan peninsula. Some of the parks are charging 50 dollars a night for 7th row parking. I made the mistake of becoming a passenger in an Aero Commander and spending 4 nights. Three dollar tacos, three dollar sodas, and seventy dollar two-star dirty MOtel rooms ain't my style.
Head for the east coast then decide as you ascend toward Veracruz where you want to jot over to your northbound exit route. There is Lake Catemaco with a good RV park. Southeastern Texas exiting via Matamoros bothers me. I avoid it and I avoid travel anywhere near Reynosa.
