The road to Hana is a destination all to it's self. Getting to Hana is all of the fun because you are traveling along the coast and through the rain forest where you can stop and see (and even swim in) several different waterfalls. Tropical plants are abundant as this side of the island gets 400 inches of rain per year.
The water is funneled through natural and man made creeks to be saved and is used as the source of fresh water here on Maui.
This photo is another one from the pier at Hana. The water here is crystal clear and makes for good snorkeling and swimming since the pier and the bay it is in protects the waters from the high waves most of the year.