Hawaii has many beautiful beaches, and there is good off shore snorkeling at some of them, but they are not like the white sand beaches of the sheltered Caribbean. Hawaiian waters are colder, wilder, and less clear.

Both destinations offer world-class snorkeling, but they cater to very different preferences. Hawaii is famous for its unique volcanic underwater topography and high "endemic" rate—about 25% of the fish you see there, like the state fish (the Humuhumunukunukuapua'a), are found nowhere else on Earth. The water is often cooler and the waves can be stronger, making it great for those who enjoy dramatic landscapes and large marine life like green sea turtles. In contrast, the Caribbean is generally better for "casual" snorkelers who want calm, bathtub-warm turquoise water and white-sand entries. The Caribbean boasts the second-largest barrier reef in the world, offering a massive diversity of colorful soft corals and sponges that you won't find in Hawaii's hard-coral dominated waters. If you want to walk off a beach into a calm lagoon with vibrant colors, the Caribbean (specifically Bonaire or the USVI) is the winner. If you prefer rugged adventure, unique species, and the chance to see dolphins or whales while swimming, Hawaii is the place for you.