usually the cruise will offer tours and they will handle your luggage and getting you to the airport. you should do the rain forest if they offer it. very nice and helps pass the time. the other option we have done is Old San Juan, also a nice tour but they get you to the airport by noonish. you could also look into an independant tour operator that may offer you the same. check things to do San Juan on trip advisor or cruise critic

Toast.......to Life; White Bay...heaven on earth.
Diane