If you look on google earth you can see the "artificial reef" just off the beach.
They have planted a row of large "strawberry" planters just off the beach, which attract the fish. If you are a better swimmer you can go the other side where there are larger fish about, definitely Barracuda, not sure what else.
Depth is probably about 5 ft so you can stand and watch the fish if you don't like snorkelling!
On the beach side of the reef, there are shoals of what I think are called garfish that dive in and out of the people, gave the wife a bit of a shock to see this thing hurtling at her through the water and turning away at the last second.
There are also rocks by the beach bar (lighthouse), where one of the "fishing party" caught an octopus.
To see the camouflage changes first hand was amazing.
The normal procedure was to catch the fish and put them in a bucket. Later the locals would come and claim them for tea, but we decided to accidentally tip the bucket far enough for the octopus to escape. It hit the rocks and disappeared! We watched it sneak off but if we hadn't known it was there we would have stepped on it.
The beach is a fairly safe snorkelling environment.

At the hotel is a dive centre, which runs proper snorkelling trips where you can go to better areas. We booked our snorkelling trip to Catalina island not with them but with the trip hut and it was run by a Diver's shop in the village. We felt we were just along to make up numbers and the divers were the main people catered for so we were dumped on a beach and left while they went off to a deep reef. The snorkelling was good but as far from the beach as you could get, which was not much use to the weaker swimmers. We saw rays, sea snakes etc.

On the Saona Island trip there is a chance to snorkel in Bayahibe bay where the fish are impressive.

Unfortunately for me, I have since been to the Conrad in Sharm, so snorkelling elsewhere is now a bit of a let down!