Los Bajos, to the east of Gibara, is accessible by a local lancha (ferry; CUC$1 each way) that leaves at least twice daily from the fishing pier on La Enramada, the waterfront road leading out of town. These boats cross the Bahía de Gibara to Playa los Bajos , from where it's 3km east to Playa Blanca. Both beaches are sandy, with swimming.
Should the ferry be out of action, Los Bajos is a rough 30km drive via Floro Pérez and Fray Benito.