More than 400 species of fish, brilliant blue water, and the white sand draw the droves to Honolulu's most popular snorkeling beach. In the early 1990s, the effects of overtourism were already starting to show, so the park created an educational center where all first-time visitors must watch a nine-minute conservation video. They also limited the flow of visitors, but even with the cap, scientists have said the 2,600 average daily beachgoers leave about 412 pounds of sunscreen in the ocean, which is detrimental to the reefs. And while change is afoot throughout the entire island to help curb overtourism and its side effects (last year the state was the first to ban toxic sunscreens, for example), the best thing travelers can do is spread the love and go to lesser-visited spots.