My group came to Northern Coast diving early in the morning needing a snorkel trip. Normally the company doesn't do their snorkel trips into the afternoon, but right away they figured out how to get us on a boat!
The staff was extremely professional and friendly and spoke excellent English, which put us right at home. The company has safe lockers to store possessions and is very neat and organized. Our guide was extremely knowledgable of the area and went out of her way to point out different fish and coral species using an easy to read chart. We spend PLENTY of time at our snorkel site and really felt like the trip was easily worth $30 USD per person. Free water was offered to us on our return trip.
The shop was not particularly busy and they went out of their way to give us a custom snorkel experience. Would recommend this to anyone looking to snorkel or dive around Sosúa.