Paradise is the busiest reef on Cozumel and it looks it in places.
Traffic. The reef lies under the approach and manoeuvring water for the cruise piers. On a four-ship day there are boats overhead constantly, several dive groups in the water at once, and snorkel flotillas working the shallow end. Visibility is generally still good, but this is not a quiet dive.
Wear. Decades of checkout dives, discover-scuba groups and snorkel traffic have left their mark. The coral cover here is thinner and lower than on the southern reefs, and storm damage over the years has flattened parts of the structure. If your only Cozumel dive is Paradise, you will leave underrating the island.
Expectations. A diver who has read about hundred-foot visibility and sheer walls, then gets a fifty-foot ridge with a cruise ship's hull overhead, feels short-changed. That is a booking problem, not a reef problem. Paradise is a very good easy dive and a superb night dive; it is not the island's showpiece.
The rules are the same as everywhere in the park: per-person daily park fee, gloves generally prohibited, no touching or standing on coral. On a shallow, crowded reef, the fin-kick damage is the one that actually accumulates, so watch what your feet are doing.