There's a pleasant two-hour walk around the headland, but carry water and sun protection. People in the villages here don't get a lot of tourists or even a lot of local passers-by so be respectful as you enter an area and seek approval before moving on. There's good snorkelling offshore and the beaches are sensational, but ask before stripping down and plunging in.
Another good walk is west along the beach from the airport. After 40 minutes you come to a limestone headland draped with vines - wade around it to the beautiful beach on the other side. There's a rusting Japanese landing barge just offshore.