I believe the shark feeding area is Andicouri Bay which is shown on your map, just below the A. It might equate to a 1 or 2 mile drive.
Something to note here... IF I am correct that Andicouri Bay is the shark feeding area ( I'm pretty sure I am)... it is very close to the Natural Bridge. I'm not sure if the terrain near andicouri bay is the same as at the Natural Bridge, but his rental vehicle would likely not have made it to the Natural Bridge - it is very difficult and dangerous terrain. It is recommended to go with a paid guide, so the terrain at Andicouri Bay is something to look into further.