Have not cruised on Triumph, but have been in San Juan for a pre and during a cruise. If you haven't seen the forts, you can walk to El Morro from the pier, its worth checking out. Also a lot of nice shops in Old San Juan as well. There is supposed to be a trolley that takes you around town, but so far I've only seen in once and the traffic there seems to never move, almost faster just walking, but you do have to walk on very narrow sidewalks and uphill, so if thats a problem, you can always grab a cab.
I did see Triumph when we were leaving from Miami on Explorer, nice looking ship, glad you have a balcony, those are the best, enjoy.
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