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Tip: These gem-like shells can only be found on the beaches of Ni`ihau, located 17 miles off the coast of Kauai.
Scuba Diving on Kauai
Beneath the waters that lap at Kauai’s shores is a teeming marine environment with a rich store of secrets available only to folks who find ways to get down under. Here scuba divers will find living coral reefs, sea caves, large varieties of exotic fish and sea turtles.
Water temperatures range from 72 degrees in winter to the low 80s in the summer, and visibility is generally good.
You can set out on your own or book a trip with one of the island’s scuba diving operators. Most offer small-group tours and a variety of courses, including beginner instruction.
– courtesy of 101 Things To Do