We weren't sure what to expect when we went last August, but we all agreed it was the most memorable day of our holiday. We enjoyed it from start to finish.
Although we enjoyed the dolphin swim, the rest of the day was, in our opinion, just as good-so much so that we have booked to go again for a day this August but without the dolphin swim.
I would book online if you are doing the dolphin swim. I had to ring as you cannot book the non dolphin swim online. However, our booking can still be viewed online.

Carole