If you are bored and want to meet people and party, there is no better time than the holidays, there are tons of activities frequented by locals and expats alike.
Remember that google translator is there to help you here is a site with a lot of activities:
http://www.calendariopr.com/diciembre
Also check out
http://www.sanjuanweeklypr.com/index.htmlhttp://caribbeanbusiness.com
And last but not least:
http://www.puertoricodaytrips.com/calendar-of-events/
Also check out activities in January, we party thru the middle of January.