Ahihi Bay and Cove is my overall favorite Maui dive site. I've dove here more than 100 times, and rarely lose interest. Just to the south of the cove, is a popular (for snorkelers, turtles and kayakers) turtle cleaning station. This is a reserve and you are likely to see large trumpet shells foraging through the sand. Occasional eagle rays and spinner dolphins cruise overhead. Eels are commonplace. The corals and fish are in great shape here, and once outside the cove, you will see few other divers. Go south for diversity and deeper water (up to 55 feet).