The island's crystal clear waters are irresistable for snorkellers, with Oro Bay's "Natural Aquarium" and Kanumera Bay being the most popular, readily accessible spots.
That said, I must admit that while there was plenty of coral here, diversity seemed pretty low.
Maybe I am just spoilt though - others said they loved it! ;-)
There are various interesting hiking trails around the island.
Perhaps the most popular is the one leading from te Kuto area up to Pic N'Ga, the island's highest point, which offers good views.
For forest walks, the east coast seemed better, with narrow trails through rainforest alive with exotic birdlife.