Swimming at the split is nice, and I do see people snorkeling. The best snorkeling is dont with a guide, at the reef. The reef is too far from shore to swim to. The boat traffice, while not heavy, is too dangerous to swim out past the end of the docks. Taking a water taxi to Caye Caulker and hooking up with a 1/2 day snorkel tour is usually much less expensive than using the packages from the cruise ships.