CAUTION: In a few days you'll fall in love with Mexico...
Nuevo Laredo is a fine border crossing - there are actually 3 bridges to cross. If you want a really mellow crossing, take the Colombia bridge that is about 20 miles west of the city.
El Potrero chico is only a few miles outside of Monterrey. The giant limestone cliffs attract rock climbers from all around the world. Relax in the small town for a few days and get accustomed with life south of the border. Then ride on
Have a great journey!