Inshore Fishing South of the Border

I have often wondered about the bays south of the Rio Grande. On one hand, I imagine miles of unspoiled and under fished water teaming with game fish. Or, on the other hand, an unregulated and therefore over fished bay system. Have any of you been there? Recently? My dad's dad fished there in the 40' s and 50's, but I never got the chance to ask him about it. I looked online for fishing regulations in Mexico, and they seem to be quite strict, at least for sport fishing. I am always in search of an adventure…