My current thinking is this is a bluethroat Wrasse.

This was at Kahalu'u Beach - the fish seem very tame.  This is a smaller fish and
didn't school.

The fish with the vertical bars are called Convict Tang's (Acanthurus triostegus). The larger black fish are probably Ring Tail Surgeonfish (Acanthurus blochii) but the photo is quite low quality.

The bright fish in the foreground is cool, but as you look into the scene you see another, and then another fish.
It must not be that hard to camoflage in this environment, so the decision to use something like
bright white and yellow, must have some biological advantage.

Coming, going, you tell me - these fish (like me) were being dragged in the current and (unlike me) stopping
on each ebb to chew one whatever was on the rocks.

These fish just hang out on the bottom in the flow.  From a distance, they look like some sort of grass just dragging in the current, but they are live.

This was at Kahalu'u Beach - the fish seem very tame.

This was at Kahalu'u Beach - the fish seem very tame.

These fish are solitary - they don't school, but they will often tag along with other fish.

These fish are solitary - they don't school, but they will often tag along with other fish.

There are a fair number of Boxfish at Kahalu'u Beach and they are so curious that
they seem agressive - they will follow the humans around.

There are a few types of coral.  The brain coral is fun but there is also a rounder coral that is common.
Where bare rock is exposed sea urchins are often present.

This was at the place of refuge - the fish were less tame than Kahalu'u Beach, but the background
was much more interesting and the water was clearer.

This was at the place of refuge - the fish were less tame than Kahalu'u Beach, but the background
was much more interesting and the water was clearer.