Tupapa Sandriver is one of Rarotonga’s more committed reef-channel dives, with a sand run bordered by coral on both sides and a steeper outer wall for divers who like changing terrain. The route starts in the surf zone and then opens into a deeper reef edge where the profile becomes more dramatic and shark sightings are a common draw. It is a better fit for confident teams who can pick a calm day and handle a more exposed entry and return.