I did the dolphin swim in Puerto Vallarta. This was one of the best things I have ever done. You spend about 30 minutes in a big pool. There were three groups of eight in the very large salt water pool. Each group had two dolphins. The dolphins love to have their bellys rubbed. There are many "Kodak" moments and there is a videographer capturing all of them. Each person has a moment when both dolphins are kissing you on the cheeks and then you get to hug one. The finale is riding the dolphin around the pool.
Buy the video! Very Cool.