I was looking at the Texas Ratio for a number of banks and observed that among the worst banks with a billion or more in assets, Puerto Rico is statistically over represented. The commonality is that they all have terrible ratings for non-performing loans...
Then there is this: http://fusion.net/leadership/story/puerto-rico-legalizing-prostitution-marijuana-fix-debt-crisis-586448
While I support legalizing drugs and prostitution, PR thinks they can be legalized and taxed to raise more money to fix their debt problems, as if "not enough taxes" are the problem as opposed to spending.
There is one good suggestion mentioned in the comments: exclude PR from the Jones Act that requires all goods to be shipped in from the US merchant fleet, which turns PR into a mercantilist colony and prevents trade with neighbors.
The best thing for PR to do would be to leave the US and become a free port but the locals are too brainwashed by US govt propaganda. They for a time even criminalized the PR independence movement, banned its flag and *speaking of* independence (no joke, Ley de Mordaza in 1948 - http://en.wikipedia.org/wiki/Gag_Law_%28Puerto_Rico%29 )