Shark's Cove on Oahu’s North Shore is a beautiful spot for snorkeling, with clear waters, stunning coral reefs, underwater caves, and lots of marine life, including many species of fish and occasional sea turtles. It's a great place to snorkel, but keep in mind the winter swell (the season of large, powerful waves) makes it inaccessible from November to April. If you're there in the summer, though, it’s definitely a must-see!