Love private islands like Half moon Cay - its one big beach party.
San Juan is a great port - lots to see and do. Old San Juan is very interesting to wander around, Fort El Morro is very interesting and very scenic- sits on the cliffs that overlook the harbor, you can watch all the comings and goings into the harbor -great place to fly kites. The rainforest is another very interesting and beautiful trip to take. San Juan has plenty of nice beaches.