Local buses and taxis cover the ferry, town, and nearby villages, but a rental car makes Curú, beach stops, and early boat departures much easier. Roads can be rough once you leave the main route, especially in the rainy season.
For island trips, book with a local boat operator and confirm exactly what is included. Some tours are simple transfers with beach time; others include lunch, snorkeling gear, or bioluminescent kayaking after dark.