Monica pretty much summed it up. My advice, try to make as much connections as fast as you can. In Mexico it is without a doubt who you know. At least try to learn Spanish if you don't know it, and use it, they'll very much appreciate it and will go the extra mile for you.
If you are going to buy property, make sure the boundary is marked.
From what I recall...
Mazatlan: Beautiful beaches, not too humid, people were cool.
Puerto Vallarta: Fucking humid as hell (it is a rain forest).
Cabo:Arid, hotter than the other two. Kick ass fishing, scuba etc.
Puerto Penasco: Weather is much like Phoenix, but a little cooler. Supposedly they
want to build it up as the new Cancun. But Arizonans have been partying there for
a long time
If you have ?'s about RP let me know.