Progresso? There are towns with that name in most states in Mexico and, if you have only visited resort areas, you have not seen Mexico. Frankly, living in a resort area as a retired ex-pat would not be my cup of tea for several reasons. In the 'off season' much of the place would be either closed or so lacking in activity that it would be boring. Of course, the heat and humidity can be unbearable. We have friends who have tried living on the coasts but, after a year or three, they have returned to the highlands. Another consideration is the availability of at least some of the amenities that expats are accustomed to finding, like DSL, Cable, Shopping, International Airport, Imported goods, theaters, movies, medical care and world class hospitals, etc. We live half a day's drive from the Pacific Coast and can go there for winter visits. Meanwhile, we have everything we need, including tennis courts, parks, restaurants and Guadalajara, right here in Jalisco. Of course, there are many other choices, but the numbers of ex-pats here tell a story. Some, of course, will want to live away from other ex-pats and that can be easily accomplished here, while retaining accessibility to whatever you want or need.
Before making any decisions, I would suggest a driving tour of several areas in Mexico at different seasons. Enjoy!

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Read "Streets of Glass" to discover the experience of a retired couple's permanent move to Lake Chapala, Jalisco, Mexico.
PM for details.