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If you are concerned about the care of dolphins, don't go swimming with them.
Whale and Dolphin Conservation have an article about the Issues with swimming with dolphins.
Dolphins are very intelligent animals, in the wild they can travel great distances. If kept in confinement , are not able to live naturally, and travel and hunt as they would in the wild. Captive dolphins can suffer from a range of illnesses, and die at a much a younger age. Dolphins are captured from wild populations, separated from their family groups, with many killed in the process.
Swimming with dolphins causes more issues - in captivity, they are not able to get away from people if they wanted, so can become stressed. They may behave aggressively - dolphins are wild animals, and can be rather large and strong, so may cause injuries to swimmers.