Originally Posted by
exwannabe
That a passport is not required does not mean they will not ask for ID.
The US State Department "suggests" you should carry ID and birth certtificate when traveling to PR & USVI.
I take this to mean that w/o these you will get in and back to the 50 states, but it might cause issues to not have them.
Rather ironic suggestion when the US considers those territories part of the US and when the US has made a stink of PR-issued ID and birth certificates.
There is no legal requirement to make the government's life easier in ways not required by law; so for travel between the mainland and SJU, not sure why the typical US citizens should go through carrying a certified copy of a birth certificate and risk having to pay replacement costs or identity theft.