Hawaii Activities, Tours & Things to Do | HawaiiActivities.com Discover the best snorkeling cruises and tours in Hawaii, from Molokini Crater and Turtle Town on Maui to Hanauma Bay on Oahu, Kealakekua Bay on the Big Island, and Napali Coast on Kauai. Swim with tropical fish, sea turtles, and vibrant coral reefs in crystal-clear waters. Choose from catamaran cruises, zodiac adventures, and guided snorkel trips for all experience levels. Find top-rated tours and tips for unforgettable ocean experiences.