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Rarotonga has several natural passages through its fringing reef, with the most popular for diving being the passages on the north and west coasts where the outer reef drops away steeply. Papua Passage on the north coast is one of the most frequently dived, offering a channel approximately 30 metres wide with walls dropping to 25 metres and regular sightings of eagle rays and reef sharks. The passages on the west coast near the Avana harbour area also provide excellent drift diving. Your dive operator will select passages based on tidal timing and current conditions.

The reef passage dives involve moderate currents and are best suited to intermediate and above divers with drift diving experience. However, Rarotonga also has sheltered lagoon sites inside the reef that are perfect for beginners and discover scuba experiences. The lagoon areas offer calm, shallow water with good coral coverage and abundant reef fish. Several dive operators on Rarotonga offer introductory dives in the lagoon as well as open water courses. The passage dives are typically recommended for divers with at least 20 logged dives.

The best diving conditions at Rarotonga occur during the dry season from April to November, when southeast trade winds provide stable weather and visibility regularly exceeds 30 metres. The wet season from December to March brings warmer water but also more rainfall, occasional cyclone risk, and reduced visibility. Humpback whales pass through Cook Islands waters from July to October, and while they are more commonly seen at Aitutaki, they are occasionally encountered at Rarotonga as well. Water temperatures are comfortable year-round at 24 to 28 degrees.

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.