Honolua Bay is a spot that many Maui snorkeling tours will stop at by boat, but you can also reach it by land. It’s north of Kapalua and the entrance is just past the overlook. You’ll park somewhere along the highway and then hike down to the beach through the most amazing forest. 

Honolua Bay is pure Maui, meaning it has a rugged magic to it. And many wild chickens. Once you make it down to the beach (all rocks), you’ll have to swim quite a ways to get to the best snorkeling (to the left and right sides of the bay). If there’s a catamaran anchored in the bay, that will give you an indication of where the snorkeling is good.