For what its worth, I had done it a number of years ago so I am not sure how much it has changed. Like the PP, I also do the Dive Quest on each trip. A week at Disney and get a dive in, the best of both worlds. We did get a backstage tour of all the facilities both inside and out. We then watched a video and had a brief discussion on conservation and the work they do with the dolphins in the classroom off stage. We then went to the viewing windows with the other guests to continue the discussion for a short while. We then went backstage locker room to get into shorty wetsuits(provided, but bring a bathing suit to wear under). You then go onstage to the center column of the aquarium and go up a stairway to the top of the aquarium. You are now on top in the middle of the "Donut" shaped aquarium. As stated you are not allowed to swim with the dolphins. They also emphasize that any interactions with the dolphins are contingent on whether they want to participate. They are not forced to. Our two dolphins that day chose to participate but I think it is very rare if they ever don't. At the edge of the deck, there is a submerged platform in about 3 ft of water. It big enough that you have no fear of falling off if you stay conscious of how far out you are on it. The cast members bring the dolphins to you on the platform where you can interact with them on a individual basis. They will also show you some things that the dolphins are taught to do. They also take a picture of you with one of the dolphins to take with you along with a t shirt. You then can shower and change back in the lockers.
Don't expect this to be like one of those resorts where you get to swim and ride the dolphins. It is a learning experience and a low key interaction. The Dolphins have there own partitioned section of the aquarium and even during Dive Quest, we are not allowed near them. Definitely not intimidating. A great experience? Yes, A little expensive, but how many opportunities do you have to touch and interact with a dolphin up close. And I think Disney does it in a responsible and respectable way with the dolphins unlike some of those other resorts.
Hope this helps