I had previously written about a Southwest promotion where you will earn 2x RR points/$ for flights to/from San Juan Puerto Rico.
Well it looks like they are really trying to increase interest in travel there because you will now get 3x RR points/$. There is no need to re-register. So now you will get 18 points/$ for flights until Dec 31, 2013. Again, bonus points will not count towards companion pass or A list Status.
FYI the current SW promotion is NOT valid for San Juan.
If you are planning a visit or need some ideas, the Points Guy website has a great city overview.