I have done the tour from the shore excursions desk twice and loved both times. If you can do the turtle farm, hell and the snorkling with stingrays. Well worth the money and it's a once in a life time experience
It was ok. We didn't do the whole park. It cost a certain amount to see the turtles and if you wanted to go through the whole park it was even more. I wish I could remember how much it cost but I was pretty amazed at how much it was per person to walk around and see a bunch of sea turtles. I think it was actually cheaper to book it on the ship as a shore excursion. Normally we go out and do things on our own because its cheaper. But in this case it wasn't. Maybe someone else can tell you what else is in the park. Good luck and have fun.
Cruising.....The only way to travel
Carnival Destiny 2005
Carnival Miracle 2006
Carnival Victory 2007
RCI Liberty of the Seas 2008
RCI Allure of the Seas 2012