Was the reef way offshore like too far to swim? Did you see this reef from the overlook on top of the mountain? If so it was Johnson's reef that supposedly is really fun when the tide is right and the swell is big. Anything but high tide and its too shallow. If you were on the beach (small and narrow) with the main road right behind it you were on trunk bay. I'm pretty sure that Johnson's reef is visible from Trunk Bay off the point of land to the right and also from cinnamon bay to the left. It's far out there though and would be a crazy paddle to get there. The reef at cinnamon breaks off the one side and produces a lumpy kind of weird right. It's not that far out even on the biggest day so I doubt you would have hesitated to go out there.
A previous poster (I forget who) said something about Cinnamon Bay being a right...maybe I got the name of the spot wrong. I think that guy was probably correct with the other name that he mentioned...not too sure. From what I could tell, it was the only decent wave on the island, at least on that particular day.