We did that on our first time in Puerto Rico and really enjoyed it. Depending on the time of year part of the ride to get there can be very warm as the buses that are used have to turn off the ac when going up the mountain. But that is the only negative and definitely not a reason not to do it. We got some beautiful photos in the forest. And we did have time to look around old San Juan after, of course this depends on what time your ship leaves port.
Star Princess 2005, Sun Princess 2005
Caribbean Princess 2006, MSC Lirica 2006 , NCL Pearl 2007, Majesty of the Seas 2008, Carnival Destiny 2008, MSC Lirica 2009, Carnival Valor 2009,Carnival Legend 2010, Carnival Liberty 2010,Carnival Fantsay 2011,Carnival Valor Feb 2012, MSC Poesia Dec 2012, MSC Poesia April 2013, Carnival Legend Nov 2013, MSC DIVINA Jan 2014
However, there are soooo many other interesting things to do in Puerto Rico that I don't know if I would recommend it for you one and only San Juan experience. The old city and the great fort are extremely interesting also.
Thank you all for the information and sharing your photos! I did see the forts last time I was in Puerto Rico our ship is there in the day and we have enough time to see the Rainforest. It's offered as a tour just for our singles group not the entire ship with Carnival so I think I will do it.
Carnival Mardi Gras 1987 (Bahamas)
Carnival Legend 2005 (Exotic Western Caribbean)
Costa Mediterrenia 2005 (Eastern Caribbean)
Carnival Pride October 2006 (Mexican Rivera)
Carnival Legend 2007 (Western Caribbean)
Carnival Glory 2009 Western Caribbean
Carnival Liberty 2011 Eastern Caribbean
Norwegian Spirit 2011 Western Caribbean
Carnival Miracle 2012 Southern Caribbean
Carnival Breeze 2013 Exotic Eastern Caribbean
Carnival Valor 2014 Southern Caribbean
Yes, the rainforests and the caves are beautiful there. And if you are there are night, the whistling you here is a frog named a Coqui, not a bird like it sounds. And try to get some homemade mofongo somewhere. YUM!
Life's a beach, I'm just playin in the sand
Carnival- Freedom- December 2008
Royal Caribbean- Navigator of the Seas- February 2011