We did the swim in Nassau and I would highly recommend it over the encounter. With the swim you actually get in the water with the dolphins. With the encounter you're in a area where the water comes up to about your knees and the dolphin swims by you. For the price difference, I think you'd like the swim much more. People who were doing the encounter we watching us and wanted to "upgrade" to a swim but couldn't as the program was full. I have to say it was one of the best excursions we've ever done.