We went on this and it was great and the guides were very very nice. We went on the afternoon one. We met by the bar at the adult beach. From there we strolled down the bicycle path. This was an educational walk and they stopped from time to time to give us some facts about the fauna or the island or about the Bahamas in general. At the end of the path, we continued on past a roped off area and through the Mangroves to where they keep the kayaks. These were double sit-upon ocean kayaks. We were experienced kayaks (we even own one of the same kind), but many of the kayakers were first timers.
The kayaking itself was in extremely shallow water. You saw a lot of sea urchins. I can't remember what else we saw, but I know that we enjoyed it a lot. We will likely do it again.
Afterwards, there was an opportunity to snorkle in the area. We didn't know that and had not brought our snorkling gear with us.