ask how to get on a city bus, they are mini van buses, they make a round trip from the port area past 7 mile beach and back to the port. 2.50 each time you get off. BUT you get to see a bit of the island. if you get lucky you will get a driver that will point out the sites as you head to the beach. it even goes by hell. really a nice little trip to the beach on the city bus.
but I believe to get it back to the port you can not have a wet bathing suit on.