I did Dolphins in Depth. There is a little lecture where they talk to you about the Dolphins Calvin and Rainier and how they teach them to do things. Then they take you down to locker rooms to get dressed in your wet suits over your swim suits. Remember to bring extra underwear for afterwards so you have something dry to wear.
Then they take you into a large tank. You walk out to an area that is kinda like a little beach, only its concrete. Each group of 1 or 2 goes forward with a trainer, they call a dolphin in and you get to do behaviours with him, you can pet him and they take a picture for you.
They tell you not to scream or do anything to freak out the dolphins because they cant make them come to you if they dont want to. We didn't have any problems although my boyfriend at the time lifted the leg of my wet suit and let this cold water in and I screamed and I was afraid the dolphin wouldn't come to me but he did. The boyfriend however....... let's just say I don't have to worry about him doing dumb stuff like that anymore.
You only go into the water up to your hips at most so you don't have to swim or anything. You don't swim with the dolphins but petting them was cool and they are sooooo big. The water part with the dolphins was maybe 30 minutes. About 5 minutes or so with just you or your party.