Praia de Indaiauba is one of Ilhabela's quieter south-coast beaches, reached by boat rather than by an easy road. The reward is clear, generally calm water, pale sand, and a wilder feel than the island's busier beaches near Vila and the ferry side.
Because access depends on sea conditions and boat arrangements, it is not a casual last-minute swim stop. Plan it as part of a south-coast boat outing, and bring what you need without leaving anything behind.