San Juan is a beautiful place. We did not take an excursion this time, because we had been there before. Be sure you tour the Old City and the fort if it is your first time there. We took a carriage ride, which we really enjoyed and then just shopped some in the Old City. It made for a really pleasant day. I did find a Coach outlet store with incredible prices better than any I've seen in the U.S.
I also found a vendor selling handmade jewelry made from tarpin scales. They were unique, beautiful and affordable. Make great gifts for daughters or friends back home.