A Southern route is a great cruise! great ports. Fly into San Juan a day or two before your cruise mainly to relax and because San Juan airport gets a bit zooey on a cruise day. There is lots to see in San Juan - take a walking tour of Old San Juan - very interesting. Go out to Fort El Morro - again very interesting, you can watch the ships coming into the harbor - great kite flying here as it tends to be on the windy side. Or you could take a tour up into the rain forest.