Dolphin Discovery is a commercial venture, located within Chankannab National Park on Cozumel. It is a recent addition, not there two years ago. We found out about it by accident as several of the staff members are internet junkies, hanging out at the ISP where Hannah went to use the computers.
As a result, Karin and Hannah went to Chankanaab one morning while I went for a bike ride. Upon their arrival, they ran into one of the staff members whom Hannah met at the Internet place. The first discovery was that the cost of a swim with the dolphins is $150! Consequently, he invited them to come see the dolphin show, which is free.
Hannah and Karin were both hoping for a more personal, less commercial interaction than that which was offered with the regular performance. In fact, Hannah sat off to the side observing the dolphins which were not currently performing.