Providenciales is filled with good snorkelling spots, but the best ones are arguably Bight Reef and Smith's Reef, both located in the central region of the island. You have good chances of spotting green turtles, southern brown stingrays and even nurse sharks. If you want to see nocturnal sea creatures like squid and octopus, you're free to do some night snorkelling (provided that you have the equipment for it).
Do & See
If there are two things Providenciales is famous for, those must be its beaches and crystalline waters. Grace Bay Beach is certainly the most visited, but don't forget about the stretches of white sand located at Sapodilla Bay and Turtle Tail. The many snorkelling and scuba diving companies will let you explore local coral reefs and marine life, in case you choose to go beyond simply enjoying the shoreline vistas.