Have you ever been to Puerto Rico? If you want a drier climate similar to Palm Springs I would suggest looking into the south side of the Island, unless more tropical is what you desire.
There isn’t much of any public transportation system. I would suggest buying a car when you get here on classificados, or shipping what you have in CA.
As far as violence, you will have that wherever you live. I’m almost all cases it will be whether you are causing issues or being disrespectful.
Puerto Rico is an amazing place, I love it here along with the people and culture. I would suggest coming to the island, renting a car and driving. You’ll see places you like and don’t. Then you’ll know what area suits you best.