"A visit to Little Water Cay offers the best chance of spotting the endangered Turks and Caicos rock iguanas that were once prolific throughout the islands. Local conservation efforts at this small islet have helped revive their population. Two boardwalks allow visitors to take an easy stroll and look for the lizards. You can visit Little Water Cayas part of an organized boat trip, or simply rent a kayak and paddle there from the Leeward Marina area on Providenciales. There is a visitor center on the island where you can pay the admission fee."
We did a boat tour and stopped at Iguana island. Cool, little place, but don't waste a lot of your time from the tour there. Warning - the iguana like bright colors, so they tried to bite at our toes.
Nick P.
Google
Nice govt run island. There is a fee for entry. Informative walking tour with guide. We saw 10 or so iguanas during the walk. They were used to being around humans so they walk right in front of you..... Definitely worth the trip if you're passing by to dive or snorkel.
Rob
Google
There is some great snorkelling right off the beach here