We went in Feb. and the 2 kids did the dolphin swim and DH and I did not. The kids are dying to go back and NOT do the dolphin swim so they can have more time to snorkle and play etc. The dolphin swim was OK for a one time thing... but for us it was very brief, the swim seemed about 10 feet and it was geared more like a photo shoot. (jmho).
Having said that, the day was the highlight of our trip.. and we did a lot that trip. We will definitely go back without the swim.
Worth it!!