I took the dolphins in depth two years ago, it probably hasnt changed much since. For the first hour and a half, you learn about conservation, see a short video, take a tour of the back stage areas of the living seas pavillion and of course learn about dolphins. It wasnt until the last 30-40 minutes of the tour that we donned wet suits(provided) and went to the very top of the aquarium (on a shallow platform) where they do all the backstage work, research, feeding etc. we were treated to some tricks by the dolphin(they only use one). we got to pet the dolphins and make them do some more tricks. We had individual pictures taken of us next to the dolphin and got them at the end of the tour. One thing you need to know is that Disney is very protective of the dolphins and will allow only limited interaction with them. Dont expect to get rides on the dolphins. They also stress that if the dolphins do not feel like participating on a particular tour, they will not force them to and we are just out of luck. Dont know if they give you a free future tour. I love dolphins and it was the first time I even got to be close to one let alone touch it so I thought the tour was great. I think its worth the $130 or what ever it is now because you just dont get to do that every day. We also got a tee shirt.
The seas aqua tour was another great tour IMO.Did it last jan. The first part is similar to the dolphins in depth tour in that you get a tour of the back stage areas. We then put on wet suits and went up to the top of the aquarium. we were given mini scuba gear (no scuba experience is necassary), floatation vest, mask, and was allowed to spend 30 min swimming along the top of the aquarium. It takes about 5 min to get used to using the scuba breather(I never used one before) but after that it was easy. If you run low on air they give you another(the size of a 2 litter bottle). Think of the aquarium as a big donut, and we were able to swim around 3/4 of it. the rest is blocked of for the dolphins. You can dive down but you can sort of put your head under like a duck and look around. You are told not to interact with any of the fishes or turtles, but if one comes near you, you can stay ther and observe. and you have to stay away fro the dolphin area. I had some pass 12 inches in front of me. None of the fishes were aggressive and seemed used to us. When you look under water, you can see the other guests in the big observation window below and wave to them. The only regret is that the time in the water wasnt long enough(again 30 min). a great experience, it gave me the bug to take up scuba diving some day. Dont remember the cost.
Hope this helps!