We just did the behind the scenes tour a week and a half ago and had a very enjoyable experience. It is 1 hour and got to learn about the rescue operations, see examples of the equipment for how they rescue sea life and learn a lot of interesting facts. They had a few injured manatees that were recently rescued and we got to see them up close in the large tanks they were recuperating in, and the staff working with them spent some time explaining about manatees, the types of injuries, their progress and about all the equipment being used to help them on the road to recovery. It was really something! We also got to see sea turtles that were recently sent down from the northern states that would be released shortly and learn about their journey as well.
The group got to pet "baby" sharks, and we got a bus tour of some more of the facilities and the end of the tour was at a Magellanic penguin enclosure that the rest of the public does not have access to. We get pretty close to them and the supervisor of the enclosure who works with the penguins brought one out so that the tour group could go up one at a time to pet it and take photos. The penguin sits on the supervisor's lap so he will be in the photos as well.
It was a very interesting tour and I completely recommend it. We learned a lot about the Sea World facility behind the scenes and we had no idea how involved they are in rescue operations in the state. Meeting the various staff was also nice and you can see how devoted they are to the animals and their well being. Our daughters really enjoyed it and it was a great way to learn and ask a lot of questions.