The main attraction was dolphins they had rescued and seem to be happy to live there, as they are taken out in the ocean for swims, but they choose to come back every time as they feel it's their home with their friends (things don't work out that way with Orcas, but they can with Dophins that can literally be happy if you entertain them, feed them and play with them). The interaction program was well designed to be kind to them, and they chose how to interact: