Babeldaob in detail
There's no public transport on Babeldaob; your best best is to hire a car in Koror or take a day tour of the island.
An excellent sealed road called 'Compact Road' goes around the island (about 85km). There's also a small network of unsealed side roads connecting the main road to the island's villages.
With your own wheels, note that some points of interest are unsigned and may be hard to find – ask for directions.