You better blend in with locals, whereas when I was there couple times, at 6'6" tall and very white, they look at me as a score. Remember that movie where Bruce Willis has a sign and naked underneath, sign was derogatory towards the locals in Harlem, PR nice areas are nice and rest in my opinion is shithole.
The vast majority will find PR appealing for the first few months - than culture shock kicks in and they all run back home. If you speak Spanish and are a hard core ocean sport type you may last about 2 years on avg in PR. I like Mexico, best of all worlds & easy transition from the U.S.. Columbia has the best looking women, IMHO anyway.
You sure about that? https://www.irs.gov/individuals/international-taxpayers/taxpayers-living-abroad "Your worldwide income is subject to U.S. income tax, regardless of where you reside." Leave tax questions to CPAs. They know the true skinny.