What are the best Snorkeling in Ko Lanta?

The best Snorkeling in Ko Lanta according to Viator travelers are: <br/><ul><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Ko-Lanta/A-full-day-exploring-Ha-and-Rok-islands-from-Koh-Lanta/d24522-71597P12" target="_blank" rel="noopener">A full Day Haa & Rok islands from Koh Lanta( By Speed Boat)</a></li><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Ko-Lanta/One-day-Phi-Phi-and-Bamboo-Island-tour-From-Koh-Lanta/d24522-71597P9" target="_blank" rel="noopener nofollow">Full-Day Phi Phi Lah, Phi Phi Don, from Koh Lanta(By Speed Boat)</a></li><li class="my-2 my-lg-0"><a href="https://avionero.partner.viator.com/tours/Ko-Lanta/A-Full-Day-Exploring-4-Islands-Koh-Ngai-Mook-Kradan-Koh-Chueak/d24522-71597P20" target="_blank" rel="noopener nofollow">Full Day 4 Islands (Koh Ngai, Mook, Kradan,Chueak) By Speed Boat</a></li></ul>