The south side of Maui (plus the west side of Maui) both have lots of coral reef with lots of sea creatures to see. Maui is a great island for wide variety of reefs to go snorkeling (and probably the best out of all of the Hawaiian islands).
In the first video, you'll see a snowflake eel slither across the open ocean floor. The second video shows the overall reef ecosystem. The third video shows a honu (turtle) swim across the surface. The fourth video shows a vantage point of Maui (facing Haleakala Volcano) and then dipping below in the reef. The fifth video shows a Giant ulua swimming on the ocean floor. And the sixth video shows a white mouth eel hiding out behind a coral head.
▶️ Watch on DTube
▶️ Watch Source (IPFS)