Coleen,
I booked the Dolphin Swim with Dolphin Encounters and on my reservation information they check you in at the Paradise Island Ferry Terminal and take you to Blue Lagoon Island at $165 per person. You had mentioned needing transportation and I am pretty sure that you don't.
www.dolphinencounters.com
you need to find you own transportation from the ship to the the paradise island ferry - that is what takes you to the dolphin swim, that is what i meant - sorry to be confusing - its a cab ride - not a big deal, just make time for it - enjoy - its totally worth it - btw - the tender took us right back to the dock of our ship, we asked them if they would so we wouldnt have to pay a cab- we of course tipped them though. ALWAYS ASK - THEY CAN SAY NO AND YOU ARE NO FURTHER BEHIND THAN YOU WERE IN THE FIRST PLACE
the web site says
"Begin your day by enjoying a relaxing 25-minute boat ride, including great views of Nassau Harbour, Paradise Island and Blue Lagoon Island. Your program will bring you in close contact with one of the Ocean's most fascinating and intelligent animals, the Bottlenose dolphin. "
But you need to get yourselves to the boat by your own means of transport - not to worry - its not too expensive - leave early enough - take it from me, i have done this and i totally think it is worth it!! it books up , dont let anyone tell you any thing else - i tried to change the time - they laughed at me

enjoy!!!!!
COLLEEN