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Both are excellent, but Aitutaki particularly shines for snorkelling because the lagoon's shallow areas are extraordinarily clear and full of life. The maximum depth inside the lagoon is about 15 metres, and many of the best coral formations sit at 3-8 metres, making them ideal for snorkel viewing. Scuba diving is available and rewarding, especially along the reef passes where larger species like giant trevally and reef sharks congregate.

Air Rarotonga operates daily flights from Rarotonga to Aitutaki, with a flight time of approximately 45 minutes. There is no ferry service. The island is small enough to explore by scooter or bicycle, and most resorts arrange lagoon tours and dive trips directly. Advance booking for flights and accommodation is recommended during peak season from June to October.

There are a small number of dive operators on Aitutaki, with the most established being local family-run businesses that offer both scuba diving and guided snorkelling tours. The limited number of operators means the dive sites remain uncrowded. Most lagoon tours include stops at One Foot Island and several snorkelling spots, while dedicated scuba trips explore the reef passes and deeper bommies.