we swam with dolphins in mexico a few years back......they had been rescued by the most lovely people who nursed them back to health after they had be found poorly following a small oil spill, they used to swim close to where the boats were.....they had them in a small cove adjacent to where it went into the sea and they let them go, but they just kept coming back all the time and just loved people but at the same time had total freedom......just lovely and the way it should be..........