kosher food
Then again, my "boss" has never been there before, so she probably doesn't have the best sense of the pros and cons.
Kosher food is nothing to stay in old San Juan for.
If you want a more downtown area as opposed to a report, then I found condado to be the nicest.
The daily minyan and chabad (possibly kosher food as well, if you order in advance) is in Isla Verda. Not the most beautiful place.