Heat, Humidity and Hurricanes come to mind. Are you prepared for the big climate change, hot is nice for a bit, but unmitigated HEAT and steamy sweat beading on your skin 24/7 humidity is different than a week in the "fall". My BFF's in-laws still live there and they try to visit
PR every couple of years. When there is a major storm power is intermitent at best and contact with DS can take up to a month. He relies on extended family telling him if something serious happened. And the economy is fairly depressed from my understanding, might or might not matter to you in the grander scheme of things....and not being a native can have greater disadvantages. I have heard from military recruiters that
PR is an awesome duty station, so many young people want to get out of what seems dead end that they have to turn people away.....could be all exaggeration as it's coming from recruiters!

Also just the general "outsider" atmosphere might be uncomfortable for a while. And the whole scorpion things eeeeeks me out, checking your shoes before putting them on and your bed....nope, I am a sissy when it comes to that!
The "REAL" cons are free medical care, a laid back atmosphere, unbelievable food, good weather most of the time, almost unlimited growing season, cheap saffron, close to the ocean (relatively) and I don't doubt a nice niche market from tourists....surely not a place people would want to move to!