I also saw a white tip shark - again, very quickly. Also, an epaulette shark, which was in shallow water and swam RIGHT past my shoulder, very, very quickly.
Ironically, I never saw this shark - but those who could free dive did, so I have a photo of it taken by someone else!! It's an adult brownbanded bamboo shark that was hiding under some coral. I was trying to photograph a porcupine fish who went under this coral - when some in our group looked down to find it, they found instead the shark!