Flying south of the border

I'm just wondering if anyone has experienced flying a light aircraft south
of the Rio Grande or in the Caribbean/Bahamas.

Generally, what are the expenses of landing, parking and fuel compared to
flying in the US?

How does this work with airports that don't have a 24-hour staff? Should
one expect corrupt officials trying to rip you off at every opportunity? Do
the medium to smaller airports have fences or do you run the risk of having
your avionics disappear overnight?

Does one need to obtain a Visa prior to the trip to pass through one country
on the way to another?


Dallas