The following link is of great value to anyone considering voyaging in Mexican waters. I have actively sought answers to many Mexico related cruising questions on Mexican specific forums.
It has to be said that unlike Cruiser Log, there are many who provide speculation as fact and who, as a result, provide cruisers with seriously poor information which could adversely affect their time in Mexican waters.
The following in my opinion and given the source, is gold for cruisers.
Marina de La Paz - Frequently asked questions
I am particularly interested in the import of goods, legitimately required for an onward journey of yachts in transit.