Getting There & Away
The daily Havana–Cienfuegos–Trinidad Víazul (www.viazul.com) bus runs through the Zapata peninsula; ask the driver if he will leave you at the Boca de Guamá ferry dock. It's not an official stop so you'll probably have to pay Playa Larga fares.
You can also travel on the daily hop-on/hop-off shuttle bus (CUC$3 daily) between Boca de Guamá and all points south to Caleta Buena (total time 2½ hours). It stops in the car park by the ferry dock.
Otherwise, it's your own wheels all the way.